billing: Support switching from monthly to annual plan.

2025-11-04 05:53:43 +00:00 · 2020-06-15 23:39:24 +05:30
parent bbb07aed38
commit cde4486f8c
46 changed files with 5981 additions and 18 deletions
--- a/corporate/lib/stripe.py
+++ b/corporate/lib/stripe.py
@@ -125,14 +125,21 @@ def next_invoice_date(plan: CustomerPlan) -> Optional[datetime]:
 def renewal_amount(plan: CustomerPlan, event_time: datetime) -> int:  # nocoverage: TODO
    if plan.fixed_price is not None:
        return plan.fixed_price
-    last_ledger_entry = make_end_of_cycle_updates_if_needed(plan, event_time)
+    new_plan, last_ledger_entry = make_end_of_cycle_updates_if_needed(plan, event_time)
    if last_ledger_entry is None:
        return 0
    if last_ledger_entry.licenses_at_next_renewal is None:
        return 0
+    if new_plan is not None:
+        plan = new_plan
    assert(plan.price_per_license is not None)  # for mypy
    return plan.price_per_license * last_ledger_entry.licenses_at_next_renewal

+def get_idempotency_key(ledger_entry: LicenseLedger) -> Optional[str]:
+    if settings.TEST_SUITE:
+        return None
+    return f'ledger_entry:{ledger_entry.id}'  # nocoverage
+
 class BillingError(Exception):
    # error messages
    CONTACT_SUPPORT = _("Something went wrong. Please contact {email}.").format(
@@ -237,14 +244,14 @@ def do_replace_payment_source(user: UserProfile, stripe_token: str,
 # event_time should roughly be timezone_now(). Not designed to handle
 # event_times in the past or future
 def make_end_of_cycle_updates_if_needed(plan: CustomerPlan,
-                                        event_time: datetime) -> Optional[LicenseLedger]:
+                                        event_time: datetime) -> Tuple[Optional[CustomerPlan], Optional[LicenseLedger]]:
    last_ledger_entry = LicenseLedger.objects.filter(plan=plan).order_by('-id').first()
    last_renewal = LicenseLedger.objects.filter(plan=plan, is_renewal=True) \
                                        .order_by('-id').first().event_time
    next_billing_cycle = start_of_next_billing_cycle(plan, last_renewal)
    if next_billing_cycle <= event_time:
        if plan.status == CustomerPlan.ACTIVE:
-            return LicenseLedger.objects.create(
+            return None, LicenseLedger.objects.create(
                plan=plan, is_renewal=True, event_time=next_billing_cycle,
                licenses=last_ledger_entry.licenses_at_next_renewal,
                licenses_at_next_renewal=last_ledger_entry.licenses_at_next_renewal)
@@ -254,14 +261,52 @@ def make_end_of_cycle_updates_if_needed(plan: CustomerPlan,
            plan.billing_cycle_anchor = plan.next_invoice_date.replace(microsecond=0)
            plan.status = CustomerPlan.ACTIVE
            plan.save(update_fields=["invoiced_through", "billing_cycle_anchor", "status"])
-            return LicenseLedger.objects.create(
+            return None, LicenseLedger.objects.create(
                plan=plan, is_renewal=True, event_time=next_billing_cycle,
                licenses=last_ledger_entry.licenses_at_next_renewal,
                licenses_at_next_renewal=last_ledger_entry.licenses_at_next_renewal)
+
+        if plan.status == CustomerPlan.SWITCH_TO_ANNUAL_AT_END_OF_CYCLE:
+            if plan.fixed_price is not None:  # nocoverage
+                raise NotImplementedError("Can't switch fixed priced monthly plan to annual.")
+
+            plan.status = CustomerPlan.ENDED
+            plan.save(update_fields=["status"])
+
+            discount = plan.customer.default_discount or plan.discount
+            _, _, _, price_per_license = compute_plan_parameters(
+                automanage_licenses=plan.automanage_licenses, billing_schedule=CustomerPlan.ANNUAL,
+                discount=plan.discount
+            )
+
+            new_plan = CustomerPlan.objects.create(
+                customer=plan.customer, billing_schedule=CustomerPlan.ANNUAL, automanage_licenses=plan.automanage_licenses,
+                charge_automatically=plan.charge_automatically, price_per_license=price_per_license,
+                discount=discount, billing_cycle_anchor=next_billing_cycle,
+                tier=plan.tier, status=CustomerPlan.ACTIVE, next_invoice_date=next_billing_cycle,
+                invoiced_through=None, invoicing_status=CustomerPlan.INITIAL_INVOICE_TO_BE_SENT,
+            )
+
+            new_plan_ledger_entry = LicenseLedger.objects.create(
+                plan=new_plan, is_renewal=True, event_time=next_billing_cycle,
+                licenses=last_ledger_entry.licenses_at_next_renewal,
+                licenses_at_next_renewal=last_ledger_entry.licenses_at_next_renewal
+            )
+
+            RealmAuditLog.objects.create(
+                realm=new_plan.customer.realm, event_time=event_time,
+                event_type=RealmAuditLog.CUSTOMER_SWITCHED_FROM_MONTHLY_TO_ANNUAL_PLAN,
+                extra_data=ujson.dumps({
+                    "monthly_plan_id": plan.id,
+                    "annual_plan_id": new_plan.id,
+                })
+            )
+            return new_plan, new_plan_ledger_entry
+
        if plan.status == CustomerPlan.DOWNGRADE_AT_END_OF_CYCLE:
            process_downgrade(plan)
-        return None
-    return last_ledger_entry
+        return None, None
+    return None, last_ledger_entry

 # Returns Customer instead of stripe_customer so that we don't make a Stripe
 # API call if there's nothing to update
@@ -410,11 +455,14 @@ def process_initial_upgrade(user: UserProfile, licenses: int, automanage_license

 def update_license_ledger_for_automanaged_plan(realm: Realm, plan: CustomerPlan,
                                               event_time: datetime) -> None:
-    last_ledger_entry = make_end_of_cycle_updates_if_needed(plan, event_time)
+    new_plan, last_ledger_entry = make_end_of_cycle_updates_if_needed(plan, event_time)
    if last_ledger_entry is None:
        return
+    if new_plan is not None:
+        plan = new_plan
    licenses_at_next_renewal = get_latest_seat_count(realm)
    licenses = max(licenses_at_next_renewal, last_ledger_entry.licenses)
+
    LicenseLedger.objects.create(
        plan=plan, event_time=event_time, licenses=licenses,
        licenses_at_next_renewal=licenses_at_next_renewal)
@@ -431,10 +479,17 @@ def invoice_plan(plan: CustomerPlan, event_time: datetime) -> None:
    if plan.invoicing_status == CustomerPlan.STARTED:
        raise NotImplementedError('Plan with invoicing_status==STARTED needs manual resolution.')
    make_end_of_cycle_updates_if_needed(plan, event_time)
-    assert(plan.invoiced_through is not None)
-    licenses_base = plan.invoiced_through.licenses
+
+    if plan.invoicing_status == CustomerPlan.INITIAL_INVOICE_TO_BE_SENT:
+        invoiced_through_id = -1
+        licenses_base = None
+    else:
+        assert(plan.invoiced_through is not None)
+        licenses_base = plan.invoiced_through.licenses
+        invoiced_through_id = plan.invoiced_through.id
+
    invoice_item_created = False
-    for ledger_entry in LicenseLedger.objects.filter(plan=plan, id__gt=plan.invoiced_through.id,
+    for ledger_entry in LicenseLedger.objects.filter(plan=plan, id__gt=invoiced_through_id,
                                                     event_time__lte=event_time).order_by('id'):
        price_args: Dict[str, int] = {}
        if ledger_entry.is_renewal:
@@ -445,7 +500,7 @@ def invoice_plan(plan: CustomerPlan, event_time: datetime) -> None:
                price_args = {'unit_amount': plan.price_per_license,
                              'quantity': ledger_entry.licenses}
            description = "Zulip Standard - renewal"
-        elif ledger_entry.licenses != licenses_base:
+        elif licenses_base is not None and ledger_entry.licenses != licenses_base:
            assert(plan.price_per_license)
            last_renewal = LicenseLedger.objects.filter(
                plan=plan, is_renewal=True, event_time__lte=ledger_entry.event_time) \
@@ -461,9 +516,6 @@ def invoice_plan(plan: CustomerPlan, event_time: datetime) -> None:
            plan.invoiced_through = ledger_entry
            plan.invoicing_status = CustomerPlan.STARTED
            plan.save(update_fields=['invoicing_status', 'invoiced_through'])
-            idempotency_key: Optional[str] = f'ledger_entry:{ledger_entry.id}'
-            if settings.TEST_SUITE:
-                idempotency_key = None
            stripe.InvoiceItem.create(
                currency='usd',
                customer=plan.customer.stripe_customer_id,
@@ -472,7 +524,7 @@ def invoice_plan(plan: CustomerPlan, event_time: datetime) -> None:
                period = {'start': datetime_to_timestamp(ledger_entry.event_time),
                          'end': datetime_to_timestamp(
                              start_of_next_billing_cycle(plan, ledger_entry.event_time))},
-                idempotency_key=idempotency_key,
+                idempotency_key=get_idempotency_key(ledger_entry),
                **price_args)
            invoice_item_created = True
        plan.invoiced_through = ledger_entry
--- a/corporate/models.py
+++ b/corporate/models.py
@@ -44,6 +44,7 @@ class CustomerPlan(models.Model):
        'LicenseLedger', null=True, on_delete=CASCADE, related_name='+')
    DONE = 1
    STARTED = 2
+    INITIAL_INVOICE_TO_BE_SENT = 3
    invoicing_status: int = models.SmallIntegerField(default=DONE)

    STANDARD = 1
@@ -54,6 +55,7 @@ class CustomerPlan(models.Model):
    ACTIVE = 1
    DOWNGRADE_AT_END_OF_CYCLE = 2
    FREE_TRIAL = 3
+    SWITCH_TO_ANNUAL_AT_END_OF_CYCLE = 4
    # "Live" plans should have a value < LIVE_STATUS_THRESHOLD.
    # There should be at most one live plan per customer.
    LIVE_STATUS_THRESHOLD = 10
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Charge.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Charge.create.1.json
@@ -0,0 +1,116 @@
+{
+  "amount": 4800,
+  "amount_refunded": 0,
+  "application": null,
+  "application_fee": null,
+  "application_fee_amount": null,
+  "balance_transaction": "txn_NORMALIZED00000000000001",
+  "billing_details": {
+    "address": {
+      "city": "Pacific",
+      "country": "United States",
+      "line1": "Under the sea,",
+      "line2": null,
+      "postal_code": "33333",
+      "state": null
+    },
+    "email": null,
+    "name": "Ada Starr",
+    "phone": null
+  },
+  "calculated_statement_descriptor": "ZULIP STANDARD",
+  "captured": true,
+  "created": 1000000000,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "description": "Upgrade to Zulip Standard, $8.0 x 6",
+  "destination": null,
+  "dispute": null,
+  "disputed": false,
+  "failure_code": null,
+  "failure_message": null,
+  "fraud_details": {},
+  "id": "ch_NORMALIZED00000000000001",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "charge",
+  "on_behalf_of": null,
+  "order": null,
+  "outcome": {
+    "network_status": "approved_by_network",
+    "reason": null,
+    "risk_level": "normal",
+    "risk_score": 00,
+    "seller_message": "Payment complete.",
+    "type": "authorized"
+  },
+  "paid": true,
+  "payment_intent": null,
+  "payment_method": "card_NORMALIZED00000000000001",
+  "payment_method_details": {
+    "card": {
+      "brand": "visa",
+      "checks": {
+        "address_line1_check": "pass",
+        "address_postal_code_check": "pass",
+        "cvc_check": "pass"
+      },
+      "country": "US",
+      "exp_month": 3,
+      "exp_year": 2033,
+      "fingerprint": "NORMALIZED000001",
+      "funding": "credit",
+      "installments": null,
+      "last4": "4242",
+      "network": "visa",
+      "three_d_secure": null,
+      "wallet": null
+    },
+    "type": "card"
+  },
+  "receipt_email": "hamlet@zulip.com",
+  "receipt_number": null,
+  "receipt_url": "https://pay.stripe.com/receipts/acct_NORMALIZED000001/ch_NORMALIZED00000000000001/rcpt_NORMALIZED000000000000000000001",
+  "refunded": false,
+  "refunds": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/charges/ch_NORMALIZED00000000000001/refunds"
+  },
+  "review": null,
+  "shipping": null,
+  "source": {
+    "address_city": "Pacific",
+    "address_country": "United States",
+    "address_line1": "Under the sea,",
+    "address_line1_check": "pass",
+    "address_line2": null,
+    "address_state": null,
+    "address_zip": "33333",
+    "address_zip_check": "pass",
+    "brand": "Visa",
+    "country": "US",
+    "customer": "cus_NORMALIZED0001",
+    "cvc_check": "pass",
+    "dynamic_last4": null,
+    "exp_month": 3,
+    "exp_year": 2033,
+    "fingerprint": "NORMALIZED000001",
+    "funding": "credit",
+    "id": "card_NORMALIZED00000000000001",
+    "last4": "4242",
+    "metadata": {},
+    "name": "Ada Starr",
+    "object": "card",
+    "tokenization_method": null
+  },
+  "source_transfer": null,
+  "statement_descriptor": "Zulip Standard",
+  "statement_descriptor_suffix": null,
+  "status": "succeeded",
+  "transfer_data": null,
+  "transfer_group": null
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Customer.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Customer.create.1.json
@@ -0,0 +1,80 @@
+{
+  "account_balance": 0,
+  "address": null,
+  "balance": 0,
+  "created": 1000000000,
+  "currency": null,
+  "default_source": "card_NORMALIZED00000000000001",
+  "delinquent": false,
+  "description": "zulip (Zulip Dev)",
+  "discount": null,
+  "email": "hamlet@zulip.com",
+  "id": "cus_NORMALIZED0001",
+  "invoice_prefix": "NORMA01",
+  "invoice_settings": {
+    "custom_fields": null,
+    "default_payment_method": null,
+    "footer": null
+  },
+  "livemode": false,
+  "metadata": {
+    "realm_id": "1",
+    "realm_str": "zulip"
+  },
+  "name": null,
+  "next_invoice_sequence": 1,
+  "object": "customer",
+  "phone": null,
+  "preferred_locales": [],
+  "shipping": null,
+  "sources": {
+    "data": [
+      {
+        "address_city": "Pacific",
+        "address_country": "United States",
+        "address_line1": "Under the sea,",
+        "address_line1_check": "pass",
+        "address_line2": null,
+        "address_state": null,
+        "address_zip": "33333",
+        "address_zip_check": "pass",
+        "brand": "Visa",
+        "country": "US",
+        "customer": "cus_NORMALIZED0001",
+        "cvc_check": "pass",
+        "dynamic_last4": null,
+        "exp_month": 3,
+        "exp_year": 2033,
+        "fingerprint": "NORMALIZED000001",
+        "funding": "credit",
+        "id": "card_NORMALIZED00000000000001",
+        "last4": "4242",
+        "metadata": {},
+        "name": "Ada Starr",
+        "object": "card",
+        "tokenization_method": null
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/customers/cus_NORMALIZED0001/sources"
+  },
+  "subscriptions": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/customers/cus_NORMALIZED0001/subscriptions"
+  },
+  "tax_exempt": "none",
+  "tax_ids": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/customers/cus_NORMALIZED0001/tax_ids"
+  },
+  "tax_info": null,
+  "tax_info_verification": null
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Customer.retrieve.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Customer.retrieve.1.json
@@ -0,0 +1,104 @@
+{
+  "account_balance": 0,
+  "address": null,
+  "balance": 0,
+  "created": 1000000000,
+  "currency": "usd",
+  "default_source": {
+    "address_city": "Pacific",
+    "address_country": "United States",
+    "address_line1": "Under the sea,",
+    "address_line1_check": "pass",
+    "address_line2": null,
+    "address_state": null,
+    "address_zip": "33333",
+    "address_zip_check": "pass",
+    "brand": "Visa",
+    "country": "US",
+    "customer": "cus_NORMALIZED0001",
+    "cvc_check": "pass",
+    "dynamic_last4": null,
+    "exp_month": 3,
+    "exp_year": 2033,
+    "fingerprint": "NORMALIZED000001",
+    "funding": "credit",
+    "id": "card_NORMALIZED00000000000001",
+    "last4": "4242",
+    "metadata": {},
+    "name": "Ada Starr",
+    "object": "card",
+    "tokenization_method": null
+  },
+  "delinquent": false,
+  "description": "zulip (Zulip Dev)",
+  "discount": null,
+  "email": "hamlet@zulip.com",
+  "id": "cus_NORMALIZED0001",
+  "invoice_prefix": "NORMA01",
+  "invoice_settings": {
+    "custom_fields": null,
+    "default_payment_method": null,
+    "footer": null
+  },
+  "livemode": false,
+  "metadata": {
+    "realm_id": "1",
+    "realm_str": "zulip"
+  },
+  "name": null,
+  "next_invoice_sequence": 2,
+  "object": "customer",
+  "phone": null,
+  "preferred_locales": [],
+  "shipping": null,
+  "sources": {
+    "data": [
+      {
+        "address_city": "Pacific",
+        "address_country": "United States",
+        "address_line1": "Under the sea,",
+        "address_line1_check": "pass",
+        "address_line2": null,
+        "address_state": null,
+        "address_zip": "33333",
+        "address_zip_check": "pass",
+        "brand": "Visa",
+        "country": "US",
+        "customer": "cus_NORMALIZED0001",
+        "cvc_check": "pass",
+        "dynamic_last4": null,
+        "exp_month": 3,
+        "exp_year": 2033,
+        "fingerprint": "NORMALIZED000001",
+        "funding": "credit",
+        "id": "card_NORMALIZED00000000000001",
+        "last4": "4242",
+        "metadata": {},
+        "name": "Ada Starr",
+        "object": "card",
+        "tokenization_method": null
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/customers/cus_NORMALIZED0001/sources"
+  },
+  "subscriptions": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/customers/cus_NORMALIZED0001/subscriptions"
+  },
+  "tax_exempt": "none",
+  "tax_ids": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/customers/cus_NORMALIZED0001/tax_ids"
+  },
+  "tax_info": null,
+  "tax_info_verification": null
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.1.json
@@ -0,0 +1,160 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 0,
+  "amount_paid": 0,
+  "amount_remaining": 0,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": null,
+  "finalized_at": null,
+  "footer": null,
+  "hosted_invoice_url": null,
+  "id": "in_NORMALIZED00000000000001",
+  "invoice_pdf": null,
+  "lines": {
+    "data": [
+      {
+        "amount": 4800,
+        "currency": "usd",
+        "description": "Zulip Standard",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000001",
+        "invoice_item": "ii_NORMALIZED00000000000001",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1328151845,
+          "start": 1325473445
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2MD2X8vgpBNGmnU3Nexq",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqrQVq8e30wd",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 800,
+          "unit_amount_decimal": "800"
+        },
+        "proration": false,
+        "quantity": 6,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2MD2X8vgpBNGxjcmXQWz"
+      },
+      {
+        "amount": -4800,
+        "currency": "usd",
+        "description": "Payment (Card ending in 4242)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000002",
+        "invoice_item": "ii_NORMALIZED00000000000002",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1000000000,
+          "start": 1000000000
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2MD2X8vgpBNGPP6MRxVi",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqIz3JTQJXqm",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": -4800,
+          "unit_amount_decimal": "-4800"
+        },
+        "proration": false,
+        "quantity": 1,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2MD2X8vgpBNGxqc69b7U"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 2,
+    "url": "/v1/invoices/in_NORMALIZED00000000000001/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0001",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "draft",
+  "status_transitions": {
+    "finalized_at": null,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 0,
+  "tax": null,
+  "tax_percent": null,
+  "total": 0,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.2.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.2.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 11200,
+  "amount_paid": 0,
+  "amount_remaining": 11200,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": null,
+  "finalized_at": null,
+  "footer": null,
+  "hosted_invoice_url": null,
+  "id": "in_NORMALIZED00000000000002",
+  "invoice_pdf": null,
+  "lines": {
+    "data": [
+      {
+        "amount": 11200,
+        "currency": "usd",
+        "description": "Additional license (Jan 2, 2012 - Feb 2, 2012)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000003",
+        "invoice_item": "ii_NORMALIZED00000000000003",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1328151845,
+          "start": 1325473445
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2PD2X8vgpBNGi2WCVoxN",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqbn9E3BYkUq",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 800,
+          "unit_amount_decimal": "800"
+        },
+        "proration": false,
+        "quantity": 14,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2PD2X8vgpBNGWj7t13XB"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000002/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0002",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "draft",
+  "status_transitions": {
+    "finalized_at": null,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 11200,
+  "tax": null,
+  "tax_percent": null,
+  "total": 11200,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.3.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.3.json
@@ -0,0 +1,160 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 200000,
+  "amount_paid": 0,
+  "amount_remaining": 200000,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": null,
+  "finalized_at": null,
+  "footer": null,
+  "hosted_invoice_url": null,
+  "id": "in_NORMALIZED00000000000003",
+  "invoice_pdf": null,
+  "lines": {
+    "data": [
+      {
+        "amount": 40000,
+        "currency": "usd",
+        "description": "Additional license (Feb 2, 2012 - Feb 2, 2013)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000004",
+        "invoice_item": "ii_NORMALIZED00000000000004",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1359774245,
+          "start": 1328151845
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2SD2X8vgpBNGDJwXOc3b",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqxNSx9MHbPC",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 5,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2SD2X8vgpBNGlalvG9cv"
+      },
+      {
+        "amount": 160000,
+        "currency": "usd",
+        "description": "Zulip Standard - renewal",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000005",
+        "invoice_item": "ii_NORMALIZED00000000000005",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1359774245,
+          "start": 1328151845
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2RD2X8vgpBNGanjAQMpk",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOquKicbsnEfk",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 20,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2RD2X8vgpBNGgza03wZ5"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 2,
+    "url": "/v1/invoices/in_NORMALIZED00000000000003/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0003",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "draft",
+  "status_transitions": {
+    "finalized_at": null,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 200000,
+  "tax": null,
+  "tax_percent": null,
+  "total": 200000,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.4.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.4.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 36830,
+  "amount_paid": 0,
+  "amount_remaining": 36830,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": null,
+  "finalized_at": null,
+  "footer": null,
+  "hosted_invoice_url": null,
+  "id": "in_NORMALIZED00000000000004",
+  "invoice_pdf": null,
+  "lines": {
+    "data": [
+      {
+        "amount": 36830,
+        "currency": "usd",
+        "description": "Additional license (Mar 2, 2012 - Feb 2, 2013)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000006",
+        "invoice_item": "ii_NORMALIZED00000000000006",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1359774245,
+          "start": 1330657445
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2VD2X8vgpBNGa0BY3luD",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqPUFMHEL03U",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 7366,
+          "unit_amount_decimal": "7366"
+        },
+        "proration": false,
+        "quantity": 5,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2VD2X8vgpBNGbpLwsVBN"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000004/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0004",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "draft",
+  "status_transitions": {
+    "finalized_at": null,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 36830,
+  "tax": null,
+  "tax_percent": null,
+  "total": 36830,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.5.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.create.5.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 240000,
+  "amount_paid": 0,
+  "amount_remaining": 240000,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": null,
+  "finalized_at": null,
+  "footer": null,
+  "hosted_invoice_url": null,
+  "id": "in_NORMALIZED00000000000005",
+  "invoice_pdf": null,
+  "lines": {
+    "data": [
+      {
+        "amount": 240000,
+        "currency": "usd",
+        "description": "Zulip Standard - renewal",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000007",
+        "invoice_item": "ii_NORMALIZED00000000000007",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1391310245,
+          "start": 1359774245
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2XD2X8vgpBNGamMRrAgW",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqc8FlpLiZkO",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 30,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2XD2X8vgpBNGlycTk5fw"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000005/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0005",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "draft",
+  "status_transitions": {
+    "finalized_at": null,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 240000,
+  "tax": null,
+  "tax_percent": null,
+  "total": 240000,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.1.json
@@ -0,0 +1,160 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 0,
+  "amount_paid": 0,
+  "amount_remaining": 0,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": true,
+  "auto_advance": false,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": 0,
+  "finalized_at": 1000000000,
+  "footer": null,
+  "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001sXXeo",
+  "id": "in_NORMALIZED00000000000001",
+  "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001sXXeo/pdf",
+  "lines": {
+    "data": [
+      {
+        "amount": 4800,
+        "currency": "usd",
+        "description": "Zulip Standard",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000001",
+        "invoice_item": "ii_NORMALIZED00000000000001",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1328151845,
+          "start": 1325473445
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2MD2X8vgpBNGmnU3Nexq",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqrQVq8e30wd",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 800,
+          "unit_amount_decimal": "800"
+        },
+        "proration": false,
+        "quantity": 6,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2MD2X8vgpBNGxjcmXQWz"
+      },
+      {
+        "amount": -4800,
+        "currency": "usd",
+        "description": "Payment (Card ending in 4242)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000002",
+        "invoice_item": "ii_NORMALIZED00000000000002",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1000000000,
+          "start": 1000000000
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2MD2X8vgpBNGPP6MRxVi",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqIz3JTQJXqm",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": -4800,
+          "unit_amount_decimal": "-4800"
+        },
+        "proration": false,
+        "quantity": 1,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2MD2X8vgpBNGxqc69b7U"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 2,
+    "url": "/v1/invoices/in_NORMALIZED00000000000001/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": null,
+  "number": "NORMALI-0001",
+  "object": "invoice",
+  "paid": true,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "paid",
+  "status_transitions": {
+    "finalized_at": 1000000000,
+    "marked_uncollectible_at": null,
+    "paid_at": 1000000000,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 0,
+  "tax": null,
+  "tax_percent": null,
+  "total": 0,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.2.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.2.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 11200,
+  "amount_paid": 0,
+  "amount_remaining": 11200,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": 0,
+  "finalized_at": 1000000000,
+  "footer": null,
+  "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002BzaWK",
+  "id": "in_NORMALIZED00000000000002",
+  "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002BzaWK/pdf",
+  "lines": {
+    "data": [
+      {
+        "amount": 11200,
+        "currency": "usd",
+        "description": "Additional license (Jan 2, 2012 - Feb 2, 2012)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000003",
+        "invoice_item": "ii_NORMALIZED00000000000003",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1328151845,
+          "start": 1325473445
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2PD2X8vgpBNGi2WCVoxN",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqbn9E3BYkUq",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 800,
+          "unit_amount_decimal": "800"
+        },
+        "proration": false,
+        "quantity": 14,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2PD2X8vgpBNGWj7t13XB"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000002/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0002",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": "pi_1GvQ2RD2X8vgpBNGtEBCkF9Z",
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "open",
+  "status_transitions": {
+    "finalized_at": 1000000000,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 11200,
+  "tax": null,
+  "tax_percent": null,
+  "total": 11200,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.3.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.3.json
@@ -0,0 +1,160 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 200000,
+  "amount_paid": 0,
+  "amount_remaining": 200000,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": 0,
+  "finalized_at": 1000000000,
+  "footer": null,
+  "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003NiCvS",
+  "id": "in_NORMALIZED00000000000003",
+  "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003NiCvS/pdf",
+  "lines": {
+    "data": [
+      {
+        "amount": 40000,
+        "currency": "usd",
+        "description": "Additional license (Feb 2, 2012 - Feb 2, 2013)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000004",
+        "invoice_item": "ii_NORMALIZED00000000000004",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1359774245,
+          "start": 1328151845
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2SD2X8vgpBNGDJwXOc3b",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqxNSx9MHbPC",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 5,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2SD2X8vgpBNGlalvG9cv"
+      },
+      {
+        "amount": 160000,
+        "currency": "usd",
+        "description": "Zulip Standard - renewal",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000005",
+        "invoice_item": "ii_NORMALIZED00000000000005",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1359774245,
+          "start": 1328151845
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2RD2X8vgpBNGanjAQMpk",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOquKicbsnEfk",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 20,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2RD2X8vgpBNGgza03wZ5"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 2,
+    "url": "/v1/invoices/in_NORMALIZED00000000000003/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0003",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": "pi_1GvQ2TD2X8vgpBNGI7xPlRLT",
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "open",
+  "status_transitions": {
+    "finalized_at": 1000000000,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 200000,
+  "tax": null,
+  "tax_percent": null,
+  "total": 200000,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.4.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.4.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 36830,
+  "amount_paid": 0,
+  "amount_remaining": 36830,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": 0,
+  "finalized_at": 1000000000,
+  "footer": null,
+  "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000004izTRV",
+  "id": "in_NORMALIZED00000000000004",
+  "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000004izTRV/pdf",
+  "lines": {
+    "data": [
+      {
+        "amount": 36830,
+        "currency": "usd",
+        "description": "Additional license (Mar 2, 2012 - Feb 2, 2013)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000006",
+        "invoice_item": "ii_NORMALIZED00000000000006",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1359774245,
+          "start": 1330657445
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2VD2X8vgpBNGa0BY3luD",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqPUFMHEL03U",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 7366,
+          "unit_amount_decimal": "7366"
+        },
+        "proration": false,
+        "quantity": 5,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2VD2X8vgpBNGbpLwsVBN"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000004/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0004",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": "pi_1GvQ2WD2X8vgpBNGdKVWsvEL",
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "open",
+  "status_transitions": {
+    "finalized_at": 1000000000,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 36830,
+  "tax": null,
+  "tax_percent": null,
+  "total": 36830,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.5.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.finalize_invoice.5.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 240000,
+  "amount_paid": 0,
+  "amount_remaining": 240000,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": 0,
+  "finalized_at": 1000000000,
+  "footer": null,
+  "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000005DACfs",
+  "id": "in_NORMALIZED00000000000005",
+  "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000005DACfs/pdf",
+  "lines": {
+    "data": [
+      {
+        "amount": 240000,
+        "currency": "usd",
+        "description": "Zulip Standard - renewal",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000007",
+        "invoice_item": "ii_NORMALIZED00000000000007",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1391310245,
+          "start": 1359774245
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2XD2X8vgpBNGamMRrAgW",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqc8FlpLiZkO",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 30,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2XD2X8vgpBNGlycTk5fw"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000005/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0005",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": "pi_1GvQ2ZD2X8vgpBNGWgT2rokR",
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "open",
+  "status_transitions": {
+    "finalized_at": 1000000000,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 240000,
+  "tax": null,
+  "tax_percent": null,
+  "total": 240000,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.list.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.list.1.json
@@ -0,0 +1,445 @@
+{
+  "data": [
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 200000,
+      "amount_paid": 0,
+      "amount_remaining": 200000,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": false,
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+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
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+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
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+      "id": "in_NORMALIZED00000000000003",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003NiCvS/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 40000,
+            "currency": "usd",
+            "description": "Additional license (Feb 2, 2012 - Feb 2, 2013)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000004",
+            "invoice_item": "ii_NORMALIZED00000000000004",
+            "livemode": false,
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+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2SD2X8vgpBNGDJwXOc3b",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqxNSx9MHbPC",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 8000,
+              "unit_amount_decimal": "8000"
+            },
+            "proration": false,
+            "quantity": 5,
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+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2SD2X8vgpBNGlalvG9cv"
+          },
+          {
+            "amount": 160000,
+            "currency": "usd",
+            "description": "Zulip Standard - renewal",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000005",
+            "invoice_item": "ii_NORMALIZED00000000000005",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
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+              "start": 1328151845
+            },
+            "plan": null,
+            "price": {
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+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2RD2X8vgpBNGanjAQMpk",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOquKicbsnEfk",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 8000,
+              "unit_amount_decimal": "8000"
+            },
+            "proration": false,
+            "quantity": 20,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2RD2X8vgpBNGgza03wZ5"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 2,
+        "url": "/v1/invoices/in_NORMALIZED00000000000003/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0003",
+      "object": "invoice",
+      "paid": false,
+      "payment_intent": "pi_1GvQ2TD2X8vgpBNGI7xPlRLT",
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": null,
+        "voided_at": null
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+      "subscription": null,
+      "subtotal": 200000,
+      "tax": null,
+      "tax_percent": null,
+      "total": 200000,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 11200,
+      "amount_paid": 0,
+      "amount_remaining": 11200,
+      "application_fee": null,
+      "attempt_count": 0,
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+      "auto_advance": true,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
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+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002BzaWK",
+      "id": "in_NORMALIZED00000000000002",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002BzaWK/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 11200,
+            "currency": "usd",
+            "description": "Additional license (Jan 2, 2012 - Feb 2, 2012)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000003",
+            "invoice_item": "ii_NORMALIZED00000000000003",
+            "livemode": false,
+            "metadata": {},
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+              "start": 1325473445
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+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2PD2X8vgpBNGi2WCVoxN",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqbn9E3BYkUq",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 800,
+              "unit_amount_decimal": "800"
+            },
+            "proration": false,
+            "quantity": 14,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2PD2X8vgpBNGWj7t13XB"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 1,
+        "url": "/v1/invoices/in_NORMALIZED00000000000002/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0002",
+      "object": "invoice",
+      "paid": false,
+      "payment_intent": "pi_1GvQ2RD2X8vgpBNGtEBCkF9Z",
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": null,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 11200,
+      "tax": null,
+      "tax_percent": null,
+      "total": 11200,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 0,
+      "amount_paid": 0,
+      "amount_remaining": 0,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": true,
+      "auto_advance": false,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001sXXeo",
+      "id": "in_NORMALIZED00000000000001",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001sXXeo/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 4800,
+            "currency": "usd",
+            "description": "Zulip Standard",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000001",
+            "invoice_item": "ii_NORMALIZED00000000000001",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1328151845,
+              "start": 1325473445
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2MD2X8vgpBNGmnU3Nexq",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqrQVq8e30wd",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 800,
+              "unit_amount_decimal": "800"
+            },
+            "proration": false,
+            "quantity": 6,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2MD2X8vgpBNGxjcmXQWz"
+          },
+          {
+            "amount": -4800,
+            "currency": "usd",
+            "description": "Payment (Card ending in 4242)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000002",
+            "invoice_item": "ii_NORMALIZED00000000000002",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1000000000,
+              "start": 1000000000
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2MD2X8vgpBNGPP6MRxVi",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqIz3JTQJXqm",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": -4800,
+              "unit_amount_decimal": "-4800"
+            },
+            "proration": false,
+            "quantity": 1,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2MD2X8vgpBNGxqc69b7U"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 2,
+        "url": "/v1/invoices/in_NORMALIZED00000000000001/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": null,
+      "number": "NORMALI-0001",
+      "object": "invoice",
+      "paid": true,
+      "payment_intent": null,
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "paid",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": 1000000000,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 0,
+      "tax": null,
+      "tax_percent": null,
+      "total": 0,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    }
+  ],
+  "has_more": false,
+  "object": "list",
+  "url": "/v1/invoices"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.list.2.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.list.2.json
@@ -0,0 +1,563 @@
+{
+  "data": [
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 36830,
+      "amount_paid": 0,
+      "amount_remaining": 36830,
+      "application_fee": null,
+      "attempt_count": 0,
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+      "auto_advance": true,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000004izTRV",
+      "id": "in_NORMALIZED00000000000004",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000004izTRV/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 36830,
+            "currency": "usd",
+            "description": "Additional license (Mar 2, 2012 - Feb 2, 2013)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000006",
+            "invoice_item": "ii_NORMALIZED00000000000006",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1359774245,
+              "start": 1330657445
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2VD2X8vgpBNGa0BY3luD",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqPUFMHEL03U",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 7366,
+              "unit_amount_decimal": "7366"
+            },
+            "proration": false,
+            "quantity": 5,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2VD2X8vgpBNGbpLwsVBN"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 1,
+        "url": "/v1/invoices/in_NORMALIZED00000000000004/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0004",
+      "object": "invoice",
+      "paid": false,
+      "payment_intent": "pi_1GvQ2WD2X8vgpBNGdKVWsvEL",
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": null,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 36830,
+      "tax": null,
+      "tax_percent": null,
+      "total": 36830,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 200000,
+      "amount_paid": 0,
+      "amount_remaining": 200000,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": false,
+      "auto_advance": true,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
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+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003NiCvS",
+      "id": "in_NORMALIZED00000000000003",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003NiCvS/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 40000,
+            "currency": "usd",
+            "description": "Additional license (Feb 2, 2012 - Feb 2, 2013)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000004",
+            "invoice_item": "ii_NORMALIZED00000000000004",
+            "livemode": false,
+            "metadata": {},
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+              "start": 1328151845
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+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2SD2X8vgpBNGDJwXOc3b",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqxNSx9MHbPC",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 8000,
+              "unit_amount_decimal": "8000"
+            },
+            "proration": false,
+            "quantity": 5,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2SD2X8vgpBNGlalvG9cv"
+          },
+          {
+            "amount": 160000,
+            "currency": "usd",
+            "description": "Zulip Standard - renewal",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000005",
+            "invoice_item": "ii_NORMALIZED00000000000005",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
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+              "start": 1328151845
+            },
+            "plan": null,
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+              "currency": "usd",
+              "id": "price_1GvQ2RD2X8vgpBNGanjAQMpk",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOquKicbsnEfk",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 8000,
+              "unit_amount_decimal": "8000"
+            },
+            "proration": false,
+            "quantity": 20,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2RD2X8vgpBNGgza03wZ5"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 2,
+        "url": "/v1/invoices/in_NORMALIZED00000000000003/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0003",
+      "object": "invoice",
+      "paid": false,
+      "payment_intent": "pi_1GvQ2TD2X8vgpBNGI7xPlRLT",
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+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
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+        "marked_uncollectible_at": null,
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+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
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+      "billing": "charge_automatically",
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+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
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+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
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+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002BzaWK",
+      "id": "in_NORMALIZED00000000000002",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002BzaWK/pdf",
+      "lines": {
+        "data": [
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+            "currency": "usd",
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+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000003",
+            "invoice_item": "ii_NORMALIZED00000000000003",
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+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2PD2X8vgpBNGi2WCVoxN",
+              "livemode": false,
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+              "object": "price",
+              "product": "prod_HUOqbn9E3BYkUq",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 800,
+              "unit_amount_decimal": "800"
+            },
+            "proration": false,
+            "quantity": 14,
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+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2PD2X8vgpBNGWj7t13XB"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 1,
+        "url": "/v1/invoices/in_NORMALIZED00000000000002/lines"
+      },
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+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0002",
+      "object": "invoice",
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+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
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+      "tax": null,
+      "tax_percent": null,
+      "total": 11200,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 0,
+      "amount_paid": 0,
+      "amount_remaining": 0,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": true,
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+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
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+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
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+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001sXXeo",
+      "id": "in_NORMALIZED00000000000001",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001sXXeo/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 4800,
+            "currency": "usd",
+            "description": "Zulip Standard",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000001",
+            "invoice_item": "ii_NORMALIZED00000000000001",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
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+            "price": {
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+              "billing_scheme": "per_unit",
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+              "currency": "usd",
+              "id": "price_1GvQ2MD2X8vgpBNGmnU3Nexq",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqrQVq8e30wd",
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+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 800,
+              "unit_amount_decimal": "800"
+            },
+            "proration": false,
+            "quantity": 6,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2MD2X8vgpBNGxjcmXQWz"
+          },
+          {
+            "amount": -4800,
+            "currency": "usd",
+            "description": "Payment (Card ending in 4242)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000002",
+            "invoice_item": "ii_NORMALIZED00000000000002",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1000000000,
+              "start": 1000000000
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2MD2X8vgpBNGPP6MRxVi",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqIz3JTQJXqm",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": -4800,
+              "unit_amount_decimal": "-4800"
+            },
+            "proration": false,
+            "quantity": 1,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2MD2X8vgpBNGxqc69b7U"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 2,
+        "url": "/v1/invoices/in_NORMALIZED00000000000001/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": null,
+      "number": "NORMALI-0001",
+      "object": "invoice",
+      "paid": true,
+      "payment_intent": null,
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "paid",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": 1000000000,
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+      },
+      "subscription": null,
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+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    }
+  ],
+  "has_more": false,
+  "object": "list",
+  "url": "/v1/invoices"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.list.3.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Invoice.list.3.json
@@ -0,0 +1,681 @@
+{
+  "data": [
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+      "currency": "usd",
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+      "customer": "cus_NORMALIZED0001",
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+      "customer_email": "hamlet@zulip.com",
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+      "id": "in_NORMALIZED00000000000005",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000005DACfs/pdf",
+      "lines": {
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+            "id": "ii_NORMALIZED00000000000007",
+            "invoice_item": "ii_NORMALIZED00000000000007",
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+              "id": "price_1GvQ2XD2X8vgpBNGamMRrAgW",
+              "livemode": false,
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+              "metadata": {},
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+              "object": "price",
+              "product": "prod_HUOqc8FlpLiZkO",
+              "recurring": null,
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+              "unit_amount_decimal": "8000"
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+      "webhooks_delivered_at": 1000000000
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+      "id": "in_NORMALIZED00000000000004",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000004izTRV/pdf",
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+      "currency": "usd",
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+      "customer": "cus_NORMALIZED0001",
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+      "id": "in_NORMALIZED00000000000003",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003NiCvS/pdf",
+      "lines": {
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+            "currency": "usd",
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+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000004",
+            "invoice_item": "ii_NORMALIZED00000000000004",
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+              "currency": "usd",
+              "id": "price_1GvQ2SD2X8vgpBNGDJwXOc3b",
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+              "object": "price",
+              "product": "prod_HUOqxNSx9MHbPC",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 8000,
+              "unit_amount_decimal": "8000"
+            },
+            "proration": false,
+            "quantity": 5,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2SD2X8vgpBNGlalvG9cv"
+          },
+          {
+            "amount": 160000,
+            "currency": "usd",
+            "description": "Zulip Standard - renewal",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000005",
+            "invoice_item": "ii_NORMALIZED00000000000005",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1359774245,
+              "start": 1328151845
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2RD2X8vgpBNGanjAQMpk",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOquKicbsnEfk",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 8000,
+              "unit_amount_decimal": "8000"
+            },
+            "proration": false,
+            "quantity": 20,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2RD2X8vgpBNGgza03wZ5"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 2,
+        "url": "/v1/invoices/in_NORMALIZED00000000000003/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0003",
+      "object": "invoice",
+      "paid": false,
+      "payment_intent": "pi_1GvQ2TD2X8vgpBNGI7xPlRLT",
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": null,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 200000,
+      "tax": null,
+      "tax_percent": null,
+      "total": 200000,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 11200,
+      "amount_paid": 0,
+      "amount_remaining": 11200,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": false,
+      "auto_advance": true,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002BzaWK",
+      "id": "in_NORMALIZED00000000000002",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002BzaWK/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 11200,
+            "currency": "usd",
+            "description": "Additional license (Jan 2, 2012 - Feb 2, 2012)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000003",
+            "invoice_item": "ii_NORMALIZED00000000000003",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1328151845,
+              "start": 1325473445
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2PD2X8vgpBNGi2WCVoxN",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqbn9E3BYkUq",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 800,
+              "unit_amount_decimal": "800"
+            },
+            "proration": false,
+            "quantity": 14,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2PD2X8vgpBNGWj7t13XB"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 1,
+        "url": "/v1/invoices/in_NORMALIZED00000000000002/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0002",
+      "object": "invoice",
+      "paid": false,
+      "payment_intent": "pi_1GvQ2RD2X8vgpBNGtEBCkF9Z",
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": null,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 11200,
+      "tax": null,
+      "tax_percent": null,
+      "total": 11200,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 0,
+      "amount_paid": 0,
+      "amount_remaining": 0,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": true,
+      "auto_advance": false,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001sXXeo",
+      "id": "in_NORMALIZED00000000000001",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001sXXeo/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 4800,
+            "currency": "usd",
+            "description": "Zulip Standard",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000001",
+            "invoice_item": "ii_NORMALIZED00000000000001",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1328151845,
+              "start": 1325473445
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2MD2X8vgpBNGmnU3Nexq",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqrQVq8e30wd",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 800,
+              "unit_amount_decimal": "800"
+            },
+            "proration": false,
+            "quantity": 6,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2MD2X8vgpBNGxjcmXQWz"
+          },
+          {
+            "amount": -4800,
+            "currency": "usd",
+            "description": "Payment (Card ending in 4242)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000002",
+            "invoice_item": "ii_NORMALIZED00000000000002",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1000000000,
+              "start": 1000000000
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2MD2X8vgpBNGPP6MRxVi",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqIz3JTQJXqm",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": -4800,
+              "unit_amount_decimal": "-4800"
+            },
+            "proration": false,
+            "quantity": 1,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2MD2X8vgpBNGxqc69b7U"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 2,
+        "url": "/v1/invoices/in_NORMALIZED00000000000001/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": null,
+      "number": "NORMALI-0001",
+      "object": "invoice",
+      "paid": true,
+      "payment_intent": null,
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "paid",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": 1000000000,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 0,
+      "tax": null,
+      "tax_percent": null,
+      "total": 0,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    }
+  ],
+  "has_more": false,
+  "object": "list",
+  "url": "/v1/invoices"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.1.json
@@ -0,0 +1,43 @@
+{
+  "amount": -4800,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Payment (Card ending in 4242)",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000002",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1000000000,
+    "start": 1000000000
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ2MD2X8vgpBNGPP6MRxVi",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqIz3JTQJXqm",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": -4800,
+    "unit_amount_decimal": "-4800"
+  },
+  "proration": false,
+  "quantity": 1,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": -4800,
+  "unit_amount_decimal": "-4800"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.2.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.2.json
@@ -0,0 +1,43 @@
+{
+  "amount": 4800,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Zulip Standard",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000001",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1328151845,
+    "start": 1325473445
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ2MD2X8vgpBNGmnU3Nexq",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqrQVq8e30wd",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": 800,
+    "unit_amount_decimal": "800"
+  },
+  "proration": false,
+  "quantity": 6,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": 800,
+  "unit_amount_decimal": "800"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.3.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.3.json
@@ -0,0 +1,43 @@
+{
+  "amount": 11200,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Additional license (Jan 2, 2012 - Feb 2, 2012)",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000003",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1328151845,
+    "start": 1325473445
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ2PD2X8vgpBNGi2WCVoxN",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqbn9E3BYkUq",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": 800,
+    "unit_amount_decimal": "800"
+  },
+  "proration": false,
+  "quantity": 14,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": 800,
+  "unit_amount_decimal": "800"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.4.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.4.json
@@ -0,0 +1,43 @@
+{
+  "amount": 160000,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Zulip Standard - renewal",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000005",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1359774245,
+    "start": 1328151845
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ2RD2X8vgpBNGanjAQMpk",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOquKicbsnEfk",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": 8000,
+    "unit_amount_decimal": "8000"
+  },
+  "proration": false,
+  "quantity": 20,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": 8000,
+  "unit_amount_decimal": "8000"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.5.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.5.json
@@ -0,0 +1,43 @@
+{
+  "amount": 40000,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Additional license (Feb 2, 2012 - Feb 2, 2013)",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000004",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1359774245,
+    "start": 1328151845
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ2SD2X8vgpBNGDJwXOc3b",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqxNSx9MHbPC",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": 8000,
+    "unit_amount_decimal": "8000"
+  },
+  "proration": false,
+  "quantity": 5,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": 8000,
+  "unit_amount_decimal": "8000"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.6.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.6.json
@@ -0,0 +1,43 @@
+{
+  "amount": 36830,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Additional license (Mar 2, 2012 - Feb 2, 2013)",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000006",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1359774245,
+    "start": 1330657445
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ2VD2X8vgpBNGa0BY3luD",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqPUFMHEL03U",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": 7366,
+    "unit_amount_decimal": "7366"
+  },
+  "proration": false,
+  "quantity": 5,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": 7366,
+  "unit_amount_decimal": "7366"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.7.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--InvoiceItem.create.7.json
@@ -0,0 +1,43 @@
+{
+  "amount": 240000,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Zulip Standard - renewal",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000007",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1391310245,
+    "start": 1359774245
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ2XD2X8vgpBNGamMRrAgW",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqc8FlpLiZkO",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": 8000,
+    "unit_amount_decimal": "8000"
+  },
+  "proration": false,
+  "quantity": 30,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": 8000,
+  "unit_amount_decimal": "8000"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Token.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_automatic_license_management--Token.create.1.json
@@ -0,0 +1,33 @@
+{
+  "card": {
+    "address_city": "Pacific",
+    "address_country": "United States",
+    "address_line1": "Under the sea,",
+    "address_line1_check": "unchecked",
+    "address_line2": null,
+    "address_state": null,
+    "address_zip": "33333",
+    "address_zip_check": "unchecked",
+    "brand": "Visa",
+    "country": "US",
+    "cvc_check": "unchecked",
+    "dynamic_last4": null,
+    "exp_month": 3,
+    "exp_year": 2033,
+    "fingerprint": "NORMALIZED000001",
+    "funding": "credit",
+    "id": "card_NORMALIZED00000000000001",
+    "last4": "4242",
+    "metadata": {},
+    "name": "Ada Starr",
+    "object": "card",
+    "tokenization_method": null
+  },
+  "client_ip": "0.0.0.0",
+  "created": 1000000000,
+  "id": "tok_NORMALIZED00000000000001",
+  "livemode": false,
+  "object": "token",
+  "type": "card",
+  "used": false
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Charge.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Charge.create.1.json
@@ -0,0 +1,116 @@
+{
+  "amount": 28000,
+  "amount_refunded": 0,
+  "application": null,
+  "application_fee": null,
+  "application_fee_amount": null,
+  "balance_transaction": "txn_NORMALIZED00000000000001",
+  "billing_details": {
+    "address": {
+      "city": "Pacific",
+      "country": "United States",
+      "line1": "Under the sea,",
+      "line2": null,
+      "postal_code": "33333",
+      "state": null
+    },
+    "email": null,
+    "name": "Ada Starr",
+    "phone": null
+  },
+  "calculated_statement_descriptor": "ZULIP STANDARD",
+  "captured": true,
+  "created": 1000000000,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "description": "Upgrade to Zulip Standard, $8.0 x 35",
+  "destination": null,
+  "dispute": null,
+  "disputed": false,
+  "failure_code": null,
+  "failure_message": null,
+  "fraud_details": {},
+  "id": "ch_NORMALIZED00000000000001",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "charge",
+  "on_behalf_of": null,
+  "order": null,
+  "outcome": {
+    "network_status": "approved_by_network",
+    "reason": null,
+    "risk_level": "normal",
+    "risk_score": 00,
+    "seller_message": "Payment complete.",
+    "type": "authorized"
+  },
+  "paid": true,
+  "payment_intent": null,
+  "payment_method": "card_NORMALIZED00000000000001",
+  "payment_method_details": {
+    "card": {
+      "brand": "visa",
+      "checks": {
+        "address_line1_check": "pass",
+        "address_postal_code_check": "pass",
+        "cvc_check": "pass"
+      },
+      "country": "US",
+      "exp_month": 3,
+      "exp_year": 2033,
+      "fingerprint": "NORMALIZED000001",
+      "funding": "credit",
+      "installments": null,
+      "last4": "4242",
+      "network": "visa",
+      "three_d_secure": null,
+      "wallet": null
+    },
+    "type": "card"
+  },
+  "receipt_email": "hamlet@zulip.com",
+  "receipt_number": null,
+  "receipt_url": "https://pay.stripe.com/receipts/acct_NORMALIZED000001/ch_NORMALIZED00000000000001/rcpt_NORMALIZED000000000000000000001",
+  "refunded": false,
+  "refunds": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/charges/ch_NORMALIZED00000000000001/refunds"
+  },
+  "review": null,
+  "shipping": null,
+  "source": {
+    "address_city": "Pacific",
+    "address_country": "United States",
+    "address_line1": "Under the sea,",
+    "address_line1_check": "pass",
+    "address_line2": null,
+    "address_state": null,
+    "address_zip": "33333",
+    "address_zip_check": "pass",
+    "brand": "Visa",
+    "country": "US",
+    "customer": "cus_NORMALIZED0001",
+    "cvc_check": "pass",
+    "dynamic_last4": null,
+    "exp_month": 3,
+    "exp_year": 2033,
+    "fingerprint": "NORMALIZED000001",
+    "funding": "credit",
+    "id": "card_NORMALIZED00000000000001",
+    "last4": "4242",
+    "metadata": {},
+    "name": "Ada Starr",
+    "object": "card",
+    "tokenization_method": null
+  },
+  "source_transfer": null,
+  "statement_descriptor": "Zulip Standard",
+  "statement_descriptor_suffix": null,
+  "status": "succeeded",
+  "transfer_data": null,
+  "transfer_group": null
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Customer.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Customer.create.1.json
@@ -0,0 +1,80 @@
+{
+  "account_balance": 0,
+  "address": null,
+  "balance": 0,
+  "created": 1000000000,
+  "currency": null,
+  "default_source": "card_NORMALIZED00000000000001",
+  "delinquent": false,
+  "description": "zulip (Zulip Dev)",
+  "discount": null,
+  "email": "hamlet@zulip.com",
+  "id": "cus_NORMALIZED0001",
+  "invoice_prefix": "NORMA01",
+  "invoice_settings": {
+    "custom_fields": null,
+    "default_payment_method": null,
+    "footer": null
+  },
+  "livemode": false,
+  "metadata": {
+    "realm_id": "1",
+    "realm_str": "zulip"
+  },
+  "name": null,
+  "next_invoice_sequence": 1,
+  "object": "customer",
+  "phone": null,
+  "preferred_locales": [],
+  "shipping": null,
+  "sources": {
+    "data": [
+      {
+        "address_city": "Pacific",
+        "address_country": "United States",
+        "address_line1": "Under the sea,",
+        "address_line1_check": "pass",
+        "address_line2": null,
+        "address_state": null,
+        "address_zip": "33333",
+        "address_zip_check": "pass",
+        "brand": "Visa",
+        "country": "US",
+        "customer": "cus_NORMALIZED0001",
+        "cvc_check": "pass",
+        "dynamic_last4": null,
+        "exp_month": 3,
+        "exp_year": 2033,
+        "fingerprint": "NORMALIZED000001",
+        "funding": "credit",
+        "id": "card_NORMALIZED00000000000001",
+        "last4": "4242",
+        "metadata": {},
+        "name": "Ada Starr",
+        "object": "card",
+        "tokenization_method": null
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/customers/cus_NORMALIZED0001/sources"
+  },
+  "subscriptions": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/customers/cus_NORMALIZED0001/subscriptions"
+  },
+  "tax_exempt": "none",
+  "tax_ids": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/customers/cus_NORMALIZED0001/tax_ids"
+  },
+  "tax_info": null,
+  "tax_info_verification": null
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Customer.retrieve.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Customer.retrieve.1.json
@@ -0,0 +1,104 @@
+{
+  "account_balance": 0,
+  "address": null,
+  "balance": 0,
+  "created": 1000000000,
+  "currency": "usd",
+  "default_source": {
+    "address_city": "Pacific",
+    "address_country": "United States",
+    "address_line1": "Under the sea,",
+    "address_line1_check": "pass",
+    "address_line2": null,
+    "address_state": null,
+    "address_zip": "33333",
+    "address_zip_check": "pass",
+    "brand": "Visa",
+    "country": "US",
+    "customer": "cus_NORMALIZED0001",
+    "cvc_check": "pass",
+    "dynamic_last4": null,
+    "exp_month": 3,
+    "exp_year": 2033,
+    "fingerprint": "NORMALIZED000001",
+    "funding": "credit",
+    "id": "card_NORMALIZED00000000000001",
+    "last4": "4242",
+    "metadata": {},
+    "name": "Ada Starr",
+    "object": "card",
+    "tokenization_method": null
+  },
+  "delinquent": false,
+  "description": "zulip (Zulip Dev)",
+  "discount": null,
+  "email": "hamlet@zulip.com",
+  "id": "cus_NORMALIZED0001",
+  "invoice_prefix": "NORMA01",
+  "invoice_settings": {
+    "custom_fields": null,
+    "default_payment_method": null,
+    "footer": null
+  },
+  "livemode": false,
+  "metadata": {
+    "realm_id": "1",
+    "realm_str": "zulip"
+  },
+  "name": null,
+  "next_invoice_sequence": 2,
+  "object": "customer",
+  "phone": null,
+  "preferred_locales": [],
+  "shipping": null,
+  "sources": {
+    "data": [
+      {
+        "address_city": "Pacific",
+        "address_country": "United States",
+        "address_line1": "Under the sea,",
+        "address_line1_check": "pass",
+        "address_line2": null,
+        "address_state": null,
+        "address_zip": "33333",
+        "address_zip_check": "pass",
+        "brand": "Visa",
+        "country": "US",
+        "customer": "cus_NORMALIZED0001",
+        "cvc_check": "pass",
+        "dynamic_last4": null,
+        "exp_month": 3,
+        "exp_year": 2033,
+        "fingerprint": "NORMALIZED000001",
+        "funding": "credit",
+        "id": "card_NORMALIZED00000000000001",
+        "last4": "4242",
+        "metadata": {},
+        "name": "Ada Starr",
+        "object": "card",
+        "tokenization_method": null
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/customers/cus_NORMALIZED0001/sources"
+  },
+  "subscriptions": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/customers/cus_NORMALIZED0001/subscriptions"
+  },
+  "tax_exempt": "none",
+  "tax_ids": {
+    "data": [],
+    "has_more": false,
+    "object": "list",
+    "total_count": 0,
+    "url": "/v1/customers/cus_NORMALIZED0001/tax_ids"
+  },
+  "tax_info": null,
+  "tax_info_verification": null
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.create.1.json
@@ -0,0 +1,160 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 0,
+  "amount_paid": 0,
+  "amount_remaining": 0,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": null,
+  "finalized_at": null,
+  "footer": null,
+  "hosted_invoice_url": null,
+  "id": "in_NORMALIZED00000000000001",
+  "invoice_pdf": null,
+  "lines": {
+    "data": [
+      {
+        "amount": 28000,
+        "currency": "usd",
+        "description": "Zulip Standard",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000001",
+        "invoice_item": "ii_NORMALIZED00000000000001",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1328151845,
+          "start": 1325473445
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2zD2X8vgpBNGDaM7ljiA",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqmw9b9tkVwI",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 800,
+          "unit_amount_decimal": "800"
+        },
+        "proration": false,
+        "quantity": 35,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2zD2X8vgpBNGBFITf66k"
+      },
+      {
+        "amount": -28000,
+        "currency": "usd",
+        "description": "Payment (Card ending in 4242)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000002",
+        "invoice_item": "ii_NORMALIZED00000000000002",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1000000000,
+          "start": 1000000000
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2zD2X8vgpBNGqrPfeYwv",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqnKCoreROal",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": -28000,
+          "unit_amount_decimal": "-28000"
+        },
+        "proration": false,
+        "quantity": 1,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2zD2X8vgpBNG6lkEsKdb"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 2,
+    "url": "/v1/invoices/in_NORMALIZED00000000000001/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0001",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "draft",
+  "status_transitions": {
+    "finalized_at": null,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 0,
+  "tax": null,
+  "tax_percent": null,
+  "total": 0,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.create.2.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.create.2.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 280000,
+  "amount_paid": 0,
+  "amount_remaining": 280000,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": null,
+  "finalized_at": null,
+  "footer": null,
+  "hosted_invoice_url": null,
+  "id": "in_NORMALIZED00000000000002",
+  "invoice_pdf": null,
+  "lines": {
+    "data": [
+      {
+        "amount": 280000,
+        "currency": "usd",
+        "description": "Zulip Standard - renewal",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000003",
+        "invoice_item": "ii_NORMALIZED00000000000003",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1359774245,
+          "start": 1328151845
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ33D2X8vgpBNG2TI3HOsm",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqHbrO8DnCsf",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 35,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ33D2X8vgpBNGO728kgr0"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000002/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0002",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "draft",
+  "status_transitions": {
+    "finalized_at": null,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 280000,
+  "tax": null,
+  "tax_percent": null,
+  "total": 280000,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.create.3.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.create.3.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 280000,
+  "amount_paid": 0,
+  "amount_remaining": 280000,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": null,
+  "finalized_at": null,
+  "footer": null,
+  "hosted_invoice_url": null,
+  "id": "in_NORMALIZED00000000000003",
+  "invoice_pdf": null,
+  "lines": {
+    "data": [
+      {
+        "amount": 280000,
+        "currency": "usd",
+        "description": "Zulip Standard - renewal",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000004",
+        "invoice_item": "ii_NORMALIZED00000000000004",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1391310245,
+          "start": 1359774245
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ35D2X8vgpBNGxxsMtJzq",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqnsmnQwOxKS",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 35,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ35D2X8vgpBNGRUNA2sh6"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000003/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0003",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "draft",
+  "status_transitions": {
+    "finalized_at": null,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 280000,
+  "tax": null,
+  "tax_percent": null,
+  "total": 280000,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.finalize_invoice.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.finalize_invoice.1.json
@@ -0,0 +1,160 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 0,
+  "amount_paid": 0,
+  "amount_remaining": 0,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": true,
+  "auto_advance": false,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": 0,
+  "finalized_at": 1000000000,
+  "footer": null,
+  "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001w996I",
+  "id": "in_NORMALIZED00000000000001",
+  "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001w996I/pdf",
+  "lines": {
+    "data": [
+      {
+        "amount": 28000,
+        "currency": "usd",
+        "description": "Zulip Standard",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000001",
+        "invoice_item": "ii_NORMALIZED00000000000001",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1328151845,
+          "start": 1325473445
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2zD2X8vgpBNGDaM7ljiA",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqmw9b9tkVwI",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 800,
+          "unit_amount_decimal": "800"
+        },
+        "proration": false,
+        "quantity": 35,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2zD2X8vgpBNGBFITf66k"
+      },
+      {
+        "amount": -28000,
+        "currency": "usd",
+        "description": "Payment (Card ending in 4242)",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000002",
+        "invoice_item": "ii_NORMALIZED00000000000002",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1000000000,
+          "start": 1000000000
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ2zD2X8vgpBNGqrPfeYwv",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqnKCoreROal",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": -28000,
+          "unit_amount_decimal": "-28000"
+        },
+        "proration": false,
+        "quantity": 1,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ2zD2X8vgpBNG6lkEsKdb"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 2,
+    "url": "/v1/invoices/in_NORMALIZED00000000000001/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": null,
+  "number": "NORMALI-0001",
+  "object": "invoice",
+  "paid": true,
+  "payment_intent": null,
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "paid",
+  "status_transitions": {
+    "finalized_at": 1000000000,
+    "marked_uncollectible_at": null,
+    "paid_at": 1000000000,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 0,
+  "tax": null,
+  "tax_percent": null,
+  "total": 0,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.finalize_invoice.2.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.finalize_invoice.2.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 280000,
+  "amount_paid": 0,
+  "amount_remaining": 280000,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": 0,
+  "finalized_at": 1000000000,
+  "footer": null,
+  "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002wWqyj",
+  "id": "in_NORMALIZED00000000000002",
+  "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002wWqyj/pdf",
+  "lines": {
+    "data": [
+      {
+        "amount": 280000,
+        "currency": "usd",
+        "description": "Zulip Standard - renewal",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000003",
+        "invoice_item": "ii_NORMALIZED00000000000003",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1359774245,
+          "start": 1328151845
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ33D2X8vgpBNG2TI3HOsm",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqHbrO8DnCsf",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 35,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ33D2X8vgpBNGO728kgr0"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000002/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0002",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": "pi_1GvQ34D2X8vgpBNGW2flNzcq",
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "open",
+  "status_transitions": {
+    "finalized_at": 1000000000,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 280000,
+  "tax": null,
+  "tax_percent": null,
+  "total": 280000,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.finalize_invoice.3.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.finalize_invoice.3.json
@@ -0,0 +1,118 @@
+{
+  "account_country": "US",
+  "account_name": null,
+  "amount_due": 280000,
+  "amount_paid": 0,
+  "amount_remaining": 280000,
+  "application_fee": null,
+  "attempt_count": 0,
+  "attempted": false,
+  "auto_advance": true,
+  "billing": "charge_automatically",
+  "billing_reason": "manual",
+  "charge": null,
+  "collection_method": "charge_automatically",
+  "created": 1000000000,
+  "currency": "usd",
+  "custom_fields": null,
+  "customer": "cus_NORMALIZED0001",
+  "customer_address": null,
+  "customer_email": "hamlet@zulip.com",
+  "customer_name": null,
+  "customer_phone": null,
+  "customer_shipping": null,
+  "customer_tax_exempt": "none",
+  "customer_tax_ids": [],
+  "date": 1000000000,
+  "default_payment_method": null,
+  "default_source": null,
+  "default_tax_rates": [],
+  "description": null,
+  "discount": null,
+  "due_date": null,
+  "ending_balance": 0,
+  "finalized_at": 1000000000,
+  "footer": null,
+  "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003r9OM2",
+  "id": "in_NORMALIZED00000000000003",
+  "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003r9OM2/pdf",
+  "lines": {
+    "data": [
+      {
+        "amount": 280000,
+        "currency": "usd",
+        "description": "Zulip Standard - renewal",
+        "discountable": false,
+        "id": "ii_NORMALIZED00000000000004",
+        "invoice_item": "ii_NORMALIZED00000000000004",
+        "livemode": false,
+        "metadata": {},
+        "object": "line_item",
+        "period": {
+          "end": 1391310245,
+          "start": 1359774245
+        },
+        "plan": null,
+        "price": {
+          "active": false,
+          "billing_scheme": "per_unit",
+          "created": 1000000000,
+          "currency": "usd",
+          "id": "price_1GvQ35D2X8vgpBNGxxsMtJzq",
+          "livemode": false,
+          "lookup_key": null,
+          "metadata": {},
+          "nickname": null,
+          "object": "price",
+          "product": "prod_HUOqnsmnQwOxKS",
+          "recurring": null,
+          "tiers_mode": null,
+          "transform_quantity": null,
+          "type": "one_time",
+          "unit_amount": 8000,
+          "unit_amount_decimal": "8000"
+        },
+        "proration": false,
+        "quantity": 35,
+        "subscription": null,
+        "tax_amounts": [],
+        "tax_rates": [],
+        "type": "invoiceitem",
+        "unique_id": "il_1GvQ35D2X8vgpBNGRUNA2sh6"
+      }
+    ],
+    "has_more": false,
+    "object": "list",
+    "total_count": 1,
+    "url": "/v1/invoices/in_NORMALIZED00000000000003/lines"
+  },
+  "livemode": false,
+  "metadata": {},
+  "next_payment_attempt": 1000000000,
+  "number": "NORMALI-0003",
+  "object": "invoice",
+  "paid": false,
+  "payment_intent": "pi_1GvQ37D2X8vgpBNGPnEnueSu",
+  "period_end": 1000000000,
+  "period_start": 1000000000,
+  "post_payment_credit_notes_amount": 0,
+  "pre_payment_credit_notes_amount": 0,
+  "receipt_number": null,
+  "starting_balance": 0,
+  "statement_descriptor": "Zulip Standard",
+  "status": "open",
+  "status_transitions": {
+    "finalized_at": 1000000000,
+    "marked_uncollectible_at": null,
+    "paid_at": null,
+    "voided_at": null
+  },
+  "subscription": null,
+  "subtotal": 280000,
+  "tax": null,
+  "tax_percent": null,
+  "total": 280000,
+  "total_tax_amounts": [],
+  "transfer_data": null,
+  "webhooks_delivered_at": 1000000000
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.list.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.list.1.json
@@ -0,0 +1,285 @@
+{
+  "data": [
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 280000,
+      "amount_paid": 0,
+      "amount_remaining": 280000,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": false,
+      "auto_advance": true,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002wWqyj",
+      "id": "in_NORMALIZED00000000000002",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002wWqyj/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 280000,
+            "currency": "usd",
+            "description": "Zulip Standard - renewal",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000003",
+            "invoice_item": "ii_NORMALIZED00000000000003",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1359774245,
+              "start": 1328151845
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ33D2X8vgpBNG2TI3HOsm",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqHbrO8DnCsf",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 8000,
+              "unit_amount_decimal": "8000"
+            },
+            "proration": false,
+            "quantity": 35,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ33D2X8vgpBNGO728kgr0"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 1,
+        "url": "/v1/invoices/in_NORMALIZED00000000000002/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0002",
+      "object": "invoice",
+      "paid": false,
+      "payment_intent": "pi_1GvQ34D2X8vgpBNGW2flNzcq",
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": null,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 280000,
+      "tax": null,
+      "tax_percent": null,
+      "total": 280000,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 0,
+      "amount_paid": 0,
+      "amount_remaining": 0,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": true,
+      "auto_advance": false,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001w996I",
+      "id": "in_NORMALIZED00000000000001",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001w996I/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 28000,
+            "currency": "usd",
+            "description": "Zulip Standard",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000001",
+            "invoice_item": "ii_NORMALIZED00000000000001",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1328151845,
+              "start": 1325473445
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2zD2X8vgpBNGDaM7ljiA",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqmw9b9tkVwI",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 800,
+              "unit_amount_decimal": "800"
+            },
+            "proration": false,
+            "quantity": 35,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2zD2X8vgpBNGBFITf66k"
+          },
+          {
+            "amount": -28000,
+            "currency": "usd",
+            "description": "Payment (Card ending in 4242)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000002",
+            "invoice_item": "ii_NORMALIZED00000000000002",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1000000000,
+              "start": 1000000000
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2zD2X8vgpBNGqrPfeYwv",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqnKCoreROal",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": -28000,
+              "unit_amount_decimal": "-28000"
+            },
+            "proration": false,
+            "quantity": 1,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2zD2X8vgpBNG6lkEsKdb"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 2,
+        "url": "/v1/invoices/in_NORMALIZED00000000000001/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": null,
+      "number": "NORMALI-0001",
+      "object": "invoice",
+      "paid": true,
+      "payment_intent": null,
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "paid",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": 1000000000,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 0,
+      "tax": null,
+      "tax_percent": null,
+      "total": 0,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    }
+  ],
+  "has_more": false,
+  "object": "list",
+  "url": "/v1/invoices"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.list.2.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Invoice.list.2.json
@@ -0,0 +1,403 @@
+{
+  "data": [
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 280000,
+      "amount_paid": 0,
+      "amount_remaining": 280000,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": false,
+      "auto_advance": true,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003r9OM2",
+      "id": "in_NORMALIZED00000000000003",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000003r9OM2/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 280000,
+            "currency": "usd",
+            "description": "Zulip Standard - renewal",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000004",
+            "invoice_item": "ii_NORMALIZED00000000000004",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1391310245,
+              "start": 1359774245
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ35D2X8vgpBNGxxsMtJzq",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqnsmnQwOxKS",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 8000,
+              "unit_amount_decimal": "8000"
+            },
+            "proration": false,
+            "quantity": 35,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ35D2X8vgpBNGRUNA2sh6"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 1,
+        "url": "/v1/invoices/in_NORMALIZED00000000000003/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0003",
+      "object": "invoice",
+      "paid": false,
+      "payment_intent": "pi_1GvQ37D2X8vgpBNGPnEnueSu",
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": null,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 280000,
+      "tax": null,
+      "tax_percent": null,
+      "total": 280000,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 280000,
+      "amount_paid": 0,
+      "amount_remaining": 280000,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": false,
+      "auto_advance": true,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002wWqyj",
+      "id": "in_NORMALIZED00000000000002",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000002wWqyj/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 280000,
+            "currency": "usd",
+            "description": "Zulip Standard - renewal",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000003",
+            "invoice_item": "ii_NORMALIZED00000000000003",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1359774245,
+              "start": 1328151845
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ33D2X8vgpBNG2TI3HOsm",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqHbrO8DnCsf",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 8000,
+              "unit_amount_decimal": "8000"
+            },
+            "proration": false,
+            "quantity": 35,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ33D2X8vgpBNGO728kgr0"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 1,
+        "url": "/v1/invoices/in_NORMALIZED00000000000002/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": 1000000000,
+      "number": "NORMALI-0002",
+      "object": "invoice",
+      "paid": false,
+      "payment_intent": "pi_1GvQ34D2X8vgpBNGW2flNzcq",
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "open",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": null,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 280000,
+      "tax": null,
+      "tax_percent": null,
+      "total": 280000,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    },
+    {
+      "account_country": "US",
+      "account_name": null,
+      "amount_due": 0,
+      "amount_paid": 0,
+      "amount_remaining": 0,
+      "application_fee": null,
+      "attempt_count": 0,
+      "attempted": true,
+      "auto_advance": false,
+      "billing": "charge_automatically",
+      "billing_reason": "manual",
+      "charge": null,
+      "collection_method": "charge_automatically",
+      "created": 1000000000,
+      "currency": "usd",
+      "custom_fields": null,
+      "customer": "cus_NORMALIZED0001",
+      "customer_address": null,
+      "customer_email": "hamlet@zulip.com",
+      "customer_name": null,
+      "customer_phone": null,
+      "customer_shipping": null,
+      "customer_tax_exempt": "none",
+      "customer_tax_ids": [],
+      "date": 1000000000,
+      "default_payment_method": null,
+      "default_source": null,
+      "default_tax_rates": [],
+      "description": null,
+      "discount": null,
+      "due_date": null,
+      "ending_balance": 0,
+      "finalized_at": 1000000000,
+      "footer": null,
+      "hosted_invoice_url": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001w996I",
+      "id": "in_NORMALIZED00000000000001",
+      "invoice_pdf": "https://pay.stripe.com/invoice/acct_NORMALIZED000001/invst_NORMALIZED0000000000000001w996I/pdf",
+      "lines": {
+        "data": [
+          {
+            "amount": 28000,
+            "currency": "usd",
+            "description": "Zulip Standard",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000001",
+            "invoice_item": "ii_NORMALIZED00000000000001",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1328151845,
+              "start": 1325473445
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2zD2X8vgpBNGDaM7ljiA",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqmw9b9tkVwI",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": 800,
+              "unit_amount_decimal": "800"
+            },
+            "proration": false,
+            "quantity": 35,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2zD2X8vgpBNGBFITf66k"
+          },
+          {
+            "amount": -28000,
+            "currency": "usd",
+            "description": "Payment (Card ending in 4242)",
+            "discountable": false,
+            "id": "ii_NORMALIZED00000000000002",
+            "invoice_item": "ii_NORMALIZED00000000000002",
+            "livemode": false,
+            "metadata": {},
+            "object": "line_item",
+            "period": {
+              "end": 1000000000,
+              "start": 1000000000
+            },
+            "plan": null,
+            "price": {
+              "active": false,
+              "billing_scheme": "per_unit",
+              "created": 1000000000,
+              "currency": "usd",
+              "id": "price_1GvQ2zD2X8vgpBNGqrPfeYwv",
+              "livemode": false,
+              "lookup_key": null,
+              "metadata": {},
+              "nickname": null,
+              "object": "price",
+              "product": "prod_HUOqnKCoreROal",
+              "recurring": null,
+              "tiers_mode": null,
+              "transform_quantity": null,
+              "type": "one_time",
+              "unit_amount": -28000,
+              "unit_amount_decimal": "-28000"
+            },
+            "proration": false,
+            "quantity": 1,
+            "subscription": null,
+            "tax_amounts": [],
+            "tax_rates": [],
+            "type": "invoiceitem",
+            "unique_id": "il_1GvQ2zD2X8vgpBNG6lkEsKdb"
+          }
+        ],
+        "has_more": false,
+        "object": "list",
+        "total_count": 2,
+        "url": "/v1/invoices/in_NORMALIZED00000000000001/lines"
+      },
+      "livemode": false,
+      "metadata": {},
+      "next_payment_attempt": null,
+      "number": "NORMALI-0001",
+      "object": "invoice",
+      "paid": true,
+      "payment_intent": null,
+      "period_end": 1000000000,
+      "period_start": 1000000000,
+      "post_payment_credit_notes_amount": 0,
+      "pre_payment_credit_notes_amount": 0,
+      "receipt_number": null,
+      "starting_balance": 0,
+      "statement_descriptor": "Zulip Standard",
+      "status": "paid",
+      "status_transitions": {
+        "finalized_at": 1000000000,
+        "marked_uncollectible_at": null,
+        "paid_at": 1000000000,
+        "voided_at": null
+      },
+      "subscription": null,
+      "subtotal": 0,
+      "tax": null,
+      "tax_percent": null,
+      "total": 0,
+      "total_tax_amounts": [],
+      "transfer_data": null,
+      "webhooks_delivered_at": 1000000000
+    }
+  ],
+  "has_more": false,
+  "object": "list",
+  "url": "/v1/invoices"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--InvoiceItem.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--InvoiceItem.create.1.json
@@ -0,0 +1,43 @@
+{
+  "amount": -28000,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Payment (Card ending in 4242)",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000002",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1000000000,
+    "start": 1000000000
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ2zD2X8vgpBNGqrPfeYwv",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqnKCoreROal",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": -28000,
+    "unit_amount_decimal": "-28000"
+  },
+  "proration": false,
+  "quantity": 1,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": -28000,
+  "unit_amount_decimal": "-28000"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--InvoiceItem.create.2.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--InvoiceItem.create.2.json
@@ -0,0 +1,43 @@
+{
+  "amount": 28000,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Zulip Standard",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000001",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1328151845,
+    "start": 1325473445
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ2zD2X8vgpBNGDaM7ljiA",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqmw9b9tkVwI",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": 800,
+    "unit_amount_decimal": "800"
+  },
+  "proration": false,
+  "quantity": 35,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": 800,
+  "unit_amount_decimal": "800"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--InvoiceItem.create.3.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--InvoiceItem.create.3.json
@@ -0,0 +1,43 @@
+{
+  "amount": 280000,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Zulip Standard - renewal",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000003",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1359774245,
+    "start": 1328151845
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ33D2X8vgpBNG2TI3HOsm",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqHbrO8DnCsf",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": 8000,
+    "unit_amount_decimal": "8000"
+  },
+  "proration": false,
+  "quantity": 35,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": 8000,
+  "unit_amount_decimal": "8000"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--InvoiceItem.create.4.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--InvoiceItem.create.4.json
@@ -0,0 +1,43 @@
+{
+  "amount": 280000,
+  "currency": "usd",
+  "customer": "cus_NORMALIZED0001",
+  "date": 1000000000,
+  "description": "Zulip Standard - renewal",
+  "discountable": false,
+  "id": "ii_NORMALIZED00000000000004",
+  "invoice": null,
+  "livemode": false,
+  "metadata": {},
+  "object": "invoiceitem",
+  "period": {
+    "end": 1391310245,
+    "start": 1359774245
+  },
+  "plan": null,
+  "price": {
+    "active": false,
+    "billing_scheme": "per_unit",
+    "created": 1000000000,
+    "currency": "usd",
+    "id": "price_1GvQ35D2X8vgpBNGxxsMtJzq",
+    "livemode": false,
+    "lookup_key": null,
+    "metadata": {},
+    "nickname": null,
+    "object": "price",
+    "product": "prod_HUOqnsmnQwOxKS",
+    "recurring": null,
+    "tiers_mode": null,
+    "transform_quantity": null,
+    "type": "one_time",
+    "unit_amount": 8000,
+    "unit_amount_decimal": "8000"
+  },
+  "proration": false,
+  "quantity": 35,
+  "subscription": null,
+  "tax_rates": [],
+  "unit_amount": 8000,
+  "unit_amount_decimal": "8000"
+}
--- a/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Token.create.1.json
+++ b/corporate/tests/stripe_fixtures/switch_from_monthly_plan_to_annual_plan_for_manual_license_management--Token.create.1.json
@@ -0,0 +1,33 @@
+{
+  "card": {
+    "address_city": "Pacific",
+    "address_country": "United States",
+    "address_line1": "Under the sea,",
+    "address_line1_check": "unchecked",
+    "address_line2": null,
+    "address_state": null,
+    "address_zip": "33333",
+    "address_zip_check": "unchecked",
+    "brand": "Visa",
+    "country": "US",
+    "cvc_check": "unchecked",
+    "dynamic_last4": null,
+    "exp_month": 3,
+    "exp_year": 2033,
+    "fingerprint": "NORMALIZED000001",
+    "funding": "credit",
+    "id": "card_NORMALIZED00000000000001",
+    "last4": "4242",
+    "metadata": {},
+    "name": "Ada Starr",
+    "object": "card",
+    "tokenization_method": null
+  },
+  "client_ip": "0.0.0.0",
+  "created": 1000000000,
+  "id": "tok_NORMALIZED00000000000001",
+  "livemode": false,
+  "object": "token",
+  "type": "card",
+  "used": false
+}
--- a/corporate/tests/test_stripe.py
+++ b/corporate/tests/test_stripe.py
@@ -1322,6 +1322,245 @@ class StripeTest(StripeTestCase):
            invoice_plans_as_needed(self.next_year + timedelta(days=400))
        mocked.assert_not_called()

+    @mock_stripe()
+    @patch("corporate.lib.stripe.billing_logger.info")
+    def test_switch_from_monthly_plan_to_annual_plan_for_automatic_license_management(self, *mocks: Mock) -> None:
+        user = self.example_user("hamlet")
+
+        self.login_user(user)
+        with patch('corporate.lib.stripe.timezone_now', return_value=self.now):
+            self.upgrade(schedule='monthly')
+        monthly_plan = get_current_plan_by_realm(user.realm)
+        assert(monthly_plan is not None)
+        self.assertEqual(monthly_plan.automanage_licenses, True)
+        self.assertEqual(monthly_plan.billing_schedule, CustomerPlan.MONTHLY)
+
+        response = self.client_post("/json/billing/plan/change",
+                                    {'status': CustomerPlan.SWITCH_TO_ANNUAL_AT_END_OF_CYCLE})
+        self.assert_json_success(response)
+        monthly_plan.refresh_from_db()
+        self.assertEqual(monthly_plan.status, CustomerPlan.SWITCH_TO_ANNUAL_AT_END_OF_CYCLE)
+        with patch('corporate.views.timezone_now', return_value=self.now):
+            response = self.client_get("/billing/")
+        self.assert_in_success_response(["be switched from monthly to annual billing on <strong>February 2, 2012"], response)
+
+        with patch("corporate.lib.stripe.get_latest_seat_count", return_value=20):
+            update_license_ledger_if_needed(user.realm, self.now)
+        self.assertEqual(LicenseLedger.objects.filter(plan=monthly_plan).count(), 2)
+        self.assertEqual(LicenseLedger.objects.order_by('-id').values_list(
+            'licenses', 'licenses_at_next_renewal').first(), (20, 20))
+
+        with patch('corporate.lib.stripe.timezone_now', return_value=self.next_month):
+            with patch("corporate.lib.stripe.get_latest_seat_count", return_value=25):
+                update_license_ledger_if_needed(user.realm, self.next_month)
+        self.assertEqual(LicenseLedger.objects.filter(plan=monthly_plan).count(), 2)
+        customer = get_customer_by_realm(user.realm)
+        assert(customer is not None)
+        self.assertEqual(CustomerPlan.objects.filter(customer=customer).count(), 2)
+        monthly_plan.refresh_from_db()
+        self.assertEqual(monthly_plan.status, CustomerPlan.ENDED)
+        self.assertEqual(monthly_plan.next_invoice_date, self.next_month)
+        annual_plan = get_current_plan_by_realm(user.realm)
+        assert(annual_plan is not None)
+        self.assertEqual(annual_plan.status, CustomerPlan.ACTIVE)
+        self.assertEqual(annual_plan.billing_schedule, CustomerPlan.ANNUAL)
+        self.assertEqual(annual_plan.invoicing_status, CustomerPlan.INITIAL_INVOICE_TO_BE_SENT)
+        self.assertEqual(annual_plan.billing_cycle_anchor, self.next_month)
+        self.assertEqual(annual_plan.next_invoice_date, self.next_month)
+        self.assertEqual(annual_plan.invoiced_through, None)
+        annual_ledger_entries = LicenseLedger.objects.filter(plan=annual_plan).order_by('id')
+        self.assertEqual(len(annual_ledger_entries), 2)
+        self.assertEqual(annual_ledger_entries[0].is_renewal, True)
+        self.assertEqual(annual_ledger_entries.values_list('licenses', 'licenses_at_next_renewal')[0], (20, 20))
+        self.assertEqual(annual_ledger_entries[1].is_renewal, False)
+        self.assertEqual(annual_ledger_entries.values_list('licenses', 'licenses_at_next_renewal')[1], (25, 25))
+
+        invoice_plans_as_needed(self.next_month)
+
+        annual_ledger_entries = LicenseLedger.objects.filter(plan=annual_plan).order_by('id')
+        self.assertEqual(len(annual_ledger_entries), 2)
+        annual_plan.refresh_from_db()
+        self.assertEqual(annual_plan.invoicing_status, CustomerPlan.DONE)
+        self.assertEqual(annual_plan.invoiced_through, annual_ledger_entries[1])
+        self.assertEqual(annual_plan.billing_cycle_anchor, self.next_month)
+        self.assertEqual(annual_plan.next_invoice_date, add_months(self.next_month, 1))
+        monthly_plan.refresh_from_db()
+        self.assertEqual(monthly_plan.next_invoice_date, None)
+
+        invoices = [invoice for invoice in stripe.Invoice.list(customer=customer.stripe_customer_id)]
+        self.assertEqual(len(invoices), 3)
+
+        annual_plan_invoice_items = [invoice_item for invoice_item in invoices[0].get("lines")]
+        self.assertEqual(len(annual_plan_invoice_items), 2)
+        annual_plan_invoice_item_params = {
+            "amount": 5 * 80 * 100,
+            "description": "Additional license (Feb 2, 2012 - Feb 2, 2013)",
+            "plan": None, "quantity": 5, "subscription": None, "discountable": False,
+            "period": {
+                "start": datetime_to_timestamp(self.next_month),
+                "end": datetime_to_timestamp(add_months(self.next_month, 12))
+            },
+        }
+        for key, value in annual_plan_invoice_item_params.items():
+            self.assertEqual(annual_plan_invoice_items[0][key], value)
+
+        annual_plan_invoice_item_params = {
+            "amount": 20 * 80 * 100, "description": "Zulip Standard - renewal",
+            "plan": None, "quantity": 20, "subscription": None, "discountable": False,
+            "period": {
+                "start": datetime_to_timestamp(self.next_month),
+                "end": datetime_to_timestamp(add_months(self.next_month, 12))
+            },
+        }
+        for key, value in annual_plan_invoice_item_params.items():
+            self.assertEqual(annual_plan_invoice_items[1][key], value)
+
+        monthly_plan_invoice_items = [invoice_item for invoice_item in invoices[1].get("lines")]
+        self.assertEqual(len(monthly_plan_invoice_items), 1)
+        monthly_plan_invoice_item_params = {
+            "amount": 14 * 8 * 100,
+            "description": "Additional license (Jan 2, 2012 - Feb 2, 2012)",
+            "plan": None, "quantity": 14, "subscription": None, "discountable": False,
+            "period": {
+                "start": datetime_to_timestamp(self.now),
+                "end": datetime_to_timestamp(self.next_month)
+            },
+        }
+        for key, value in monthly_plan_invoice_item_params.items():
+            self.assertEqual(monthly_plan_invoice_items[0][key], value)
+
+        with patch("corporate.lib.stripe.get_latest_seat_count", return_value=30):
+            update_license_ledger_if_needed(user.realm, add_months(self.next_month, 1))
+        invoice_plans_as_needed(add_months(self.next_month, 1))
+
+        invoices = [invoice for invoice in stripe.Invoice.list(customer=customer.stripe_customer_id)]
+        self.assertEqual(len(invoices), 4)
+
+        monthly_plan_invoice_items = [invoice_item for invoice_item in invoices[0].get("lines")]
+        self.assertEqual(len(monthly_plan_invoice_items), 1)
+        monthly_plan_invoice_item_params = {
+            "amount": 5 * 7366,
+            "description": "Additional license (Mar 2, 2012 - Feb 2, 2013)",
+            "plan": None, "quantity": 5, "subscription": None, "discountable": False,
+            "period": {
+                "start": datetime_to_timestamp(add_months(self.next_month, 1)),
+                "end": datetime_to_timestamp(add_months(self.next_month, 12))
+            },
+        }
+        for key, value in monthly_plan_invoice_item_params.items():
+            self.assertEqual(monthly_plan_invoice_items[0][key], value)
+        invoice_plans_as_needed(add_months(self.now, 13))
+
+        invoices = [invoice for invoice in stripe.Invoice.list(customer=customer.stripe_customer_id)]
+        self.assertEqual(len(invoices), 5)
+
+        annual_plan_invoice_items = [invoice_item for invoice_item in invoices[0].get("lines")]
+        self.assertEqual(len(annual_plan_invoice_items), 1)
+        annual_plan_invoice_item_params = {
+            "amount": 30 * 80 * 100,
+            "description": "Zulip Standard - renewal",
+            "plan": None, "quantity": 30, "subscription": None, "discountable": False,
+            "period": {
+                "start": datetime_to_timestamp(add_months(self.next_month, 12)),
+                "end": datetime_to_timestamp(add_months(self.next_month, 24))
+            },
+        }
+        for key, value in annual_plan_invoice_item_params.items():
+            self.assertEqual(annual_plan_invoice_items[0][key], value)
+
+    @mock_stripe()
+    @patch("corporate.lib.stripe.billing_logger.info")
+    def test_switch_from_monthly_plan_to_annual_plan_for_manual_license_management(self, *mocks: Mock) -> None:
+        user = self.example_user("hamlet")
+        num_licenses = 35
+
+        self.login_user(user)
+        with patch('corporate.lib.stripe.timezone_now', return_value=self.now):
+            self.upgrade(schedule='monthly', license_management='manual', licenses=num_licenses)
+        monthly_plan = get_current_plan_by_realm(user.realm)
+        assert(monthly_plan is not None)
+        self.assertEqual(monthly_plan.automanage_licenses, False)
+        self.assertEqual(monthly_plan.billing_schedule, CustomerPlan.MONTHLY)
+
+        response = self.client_post("/json/billing/plan/change",
+                                    {'status': CustomerPlan.SWITCH_TO_ANNUAL_AT_END_OF_CYCLE})
+        self.assert_json_success(response)
+        monthly_plan.refresh_from_db()
+        self.assertEqual(monthly_plan.status, CustomerPlan.SWITCH_TO_ANNUAL_AT_END_OF_CYCLE)
+        with patch('corporate.views.timezone_now', return_value=self.now):
+            response = self.client_get("/billing/")
+        self.assert_in_success_response(["be switched from monthly to annual billing on <strong>February 2, 2012"], response)
+
+        with patch('corporate.lib.stripe.timezone_now', return_value=self.next_month):
+            invoice_plans_as_needed(self.next_month)
+
+        self.assertEqual(LicenseLedger.objects.filter(plan=monthly_plan).count(), 1)
+        customer = get_customer_by_realm(user.realm)
+        assert(customer is not None)
+        self.assertEqual(CustomerPlan.objects.filter(customer=customer).count(), 2)
+        monthly_plan.refresh_from_db()
+        self.assertEqual(monthly_plan.status, CustomerPlan.ENDED)
+        self.assertEqual(monthly_plan.next_invoice_date, None)
+        annual_plan = get_current_plan_by_realm(user.realm)
+        assert(annual_plan is not None)
+        self.assertEqual(annual_plan.status, CustomerPlan.ACTIVE)
+        self.assertEqual(annual_plan.billing_schedule, CustomerPlan.ANNUAL)
+        self.assertEqual(annual_plan.invoicing_status, CustomerPlan.INITIAL_INVOICE_TO_BE_SENT)
+        self.assertEqual(annual_plan.billing_cycle_anchor, self.next_month)
+        self.assertEqual(annual_plan.next_invoice_date, self.next_month)
+        annual_ledger_entries = LicenseLedger.objects.filter(plan=annual_plan).order_by('id')
+        self.assertEqual(len(annual_ledger_entries), 1)
+        self.assertEqual(annual_ledger_entries[0].is_renewal, True)
+        self.assertEqual(annual_ledger_entries.values_list('licenses', 'licenses_at_next_renewal')[0], (num_licenses, num_licenses))
+        self.assertEqual(annual_plan.invoiced_through, None)
+
+        with patch('corporate.lib.stripe.timezone_now', return_value=self.next_month):
+            invoice_plans_as_needed(self.next_month + timedelta(days=1))
+
+        annual_plan.refresh_from_db()
+        self.assertEqual(annual_plan.invoiced_through, annual_ledger_entries[0])
+        self.assertEqual(annual_plan.next_invoice_date, add_months(self.next_month, 12))
+        self.assertEqual(annual_plan.invoicing_status, CustomerPlan.DONE)
+
+        invoices = [invoice for invoice in stripe.Invoice.list(customer=customer.stripe_customer_id)]
+        self.assertEqual(len(invoices), 2)
+
+        annual_plan_invoice_items = [invoice_item for invoice_item in invoices[0].get("lines")]
+        self.assertEqual(len(annual_plan_invoice_items), 1)
+        annual_plan_invoice_item_params = {
+            "amount": num_licenses * 80 * 100, "description": "Zulip Standard - renewal",
+            "plan": None, "quantity": num_licenses, "subscription": None, "discountable": False,
+            "period": {
+                "start": datetime_to_timestamp(self.next_month),
+                "end": datetime_to_timestamp(add_months(self.next_month, 12))
+            },
+        }
+        for key, value in annual_plan_invoice_item_params.items():
+            self.assertEqual(annual_plan_invoice_items[0][key], value)
+
+        with patch('corporate.lib.stripe.invoice_plan') as m:
+            invoice_plans_as_needed(add_months(self.now, 2))
+            m.assert_not_called()
+
+        invoice_plans_as_needed(add_months(self.now, 13))
+
+        invoices = [invoice for invoice in stripe.Invoice.list(customer=customer.stripe_customer_id)]
+        self.assertEqual(len(invoices), 3)
+
+        annual_plan_invoice_items = [invoice_item for invoice_item in invoices[0].get("lines")]
+        self.assertEqual(len(annual_plan_invoice_items), 1)
+        annual_plan_invoice_item_params = {
+            "amount": num_licenses * 80 * 100,
+            "description": "Zulip Standard - renewal",
+            "plan": None, "quantity": num_licenses, "subscription": None, "discountable": False,
+            "period": {
+                "start": datetime_to_timestamp(add_months(self.next_month, 12)),
+                "end": datetime_to_timestamp(add_months(self.next_month, 24))
+            },
+        }
+        for key, value in annual_plan_invoice_item_params.items():
+            self.assertEqual(annual_plan_invoice_items[0][key], value)
+
    @patch("corporate.lib.stripe.billing_logger.info")
    def test_reupgrade_after_plan_status_changed_to_downgrade_at_end_of_cycle(self, mock_: Mock) -> None:
        user = self.example_user("hamlet")
@@ -1719,7 +1958,8 @@ class LicenseLedgerTest(StripeTestCase):
        self.assertEqual(LicenseLedger.objects.count(), 1)
        # Plan needs to renew
        # TODO: do_deactivate_user for a user, so that licenses_at_next_renewal != licenses
-        ledger_entry = make_end_of_cycle_updates_if_needed(plan, self.next_year)
+        new_plan, ledger_entry = make_end_of_cycle_updates_if_needed(plan, self.next_year)
+        self.assertIsNone(new_plan)
        self.assertEqual(LicenseLedger.objects.count(), 2)
        ledger_params = {
            'plan': plan, 'is_renewal': True, 'event_time': self.next_year,
--- a/corporate/views.py
+++ b/corporate/views.py
@@ -200,14 +200,17 @@ def billing_home(request: HttpRequest) -> HttpResponse:
    plan = get_current_plan_by_customer(customer)
    if plan is not None:
        now = timezone_now()
-        last_ledger_entry = make_end_of_cycle_updates_if_needed(plan, now)
+        new_plan, last_ledger_entry = make_end_of_cycle_updates_if_needed(plan, now)
        if last_ledger_entry is not None:
+            if new_plan is not None:  # nocoverage
+                plan = new_plan
            plan_name = {
                CustomerPlan.STANDARD: 'Zulip Standard',
                CustomerPlan.PLUS: 'Zulip Plus',
            }[plan.tier]
            free_trial = plan.status == CustomerPlan.FREE_TRIAL
            downgrade_at_end_of_cycle = plan.status == CustomerPlan.DOWNGRADE_AT_END_OF_CYCLE
+            switch_to_annual_at_end_of_cycle = plan.status == CustomerPlan.SWITCH_TO_ANNUAL_AT_END_OF_CYCLE
            licenses = last_ledger_entry.licenses
            licenses_used = get_latest_seat_count(user.realm)
            # Should do this in javascript, using the user's timezone
@@ -226,6 +229,7 @@ def billing_home(request: HttpRequest) -> HttpResponse:
                'free_trial': free_trial,
                'downgrade_at_end_of_cycle': downgrade_at_end_of_cycle,
                'automanage_licenses': plan.automanage_licenses,
+                'switch_to_annual_at_end_of_cycle': switch_to_annual_at_end_of_cycle,
                'licenses': licenses,
                'licenses_used': licenses_used,
                'renewal_date': renewal_date,
@@ -244,7 +248,8 @@ def billing_home(request: HttpRequest) -> HttpResponse:
@has_request_variables
 def change_plan_status(request: HttpRequest, user: UserProfile,
                       status: int=REQ("status", validator=check_int)) -> HttpResponse:
-    assert(status in [CustomerPlan.ACTIVE, CustomerPlan.DOWNGRADE_AT_END_OF_CYCLE, CustomerPlan.ENDED])
+    assert(status in [CustomerPlan.ACTIVE, CustomerPlan.DOWNGRADE_AT_END_OF_CYCLE,
+                      CustomerPlan.SWITCH_TO_ANNUAL_AT_END_OF_CYCLE, CustomerPlan.ENDED])

    plan = get_current_plan_by_realm(user.realm)
    assert(plan is not None)  # for mypy
@@ -255,6 +260,11 @@ def change_plan_status(request: HttpRequest, user: UserProfile,
    elif status == CustomerPlan.DOWNGRADE_AT_END_OF_CYCLE:
        assert(plan.status == CustomerPlan.ACTIVE)
        do_change_plan_status(plan, status)
+    elif status == CustomerPlan.SWITCH_TO_ANNUAL_AT_END_OF_CYCLE:
+        assert(plan.billing_schedule == CustomerPlan.MONTHLY)
+        assert(plan.status == CustomerPlan.ACTIVE)
+        assert(plan.fixed_price is None)
+        do_change_plan_status(plan, status)
    elif status == CustomerPlan.ENDED:
        assert(plan.status == CustomerPlan.FREE_TRIAL)
        downgrade_now(user.realm)
--- a/templates/corporate/billing.html
+++ b/templates/corporate/billing.html
@@ -51,6 +51,8 @@
                                <strong>${{ renewal_amount }}</strong>.
                                {% elif downgrade_at_end_of_cycle %}
                                Your plan will be downgraded to <strong>Zulip Limited</strong> on <strong>{{ renewal_date }}</strong>.
+                                {% elif switch_to_annual_at_end_of_cycle %}
+                                Your plan will be switched from monthly to annual billing on <strong>{{ renewal_date }}</strong>.
                                {% else %}
                                Your plan will renew on <strong>{{ renewal_date }}</strong> for
                                <strong>${{ renewal_amount }}</strong>.
--- a/zerver/models.py
+++ b/zerver/models.py
@@ -2674,6 +2674,7 @@ class AbstractRealmAuditLog(models.Model):

    CUSTOMER_CREATED = 501
    CUSTOMER_PLAN_CREATED = 502
+    CUSTOMER_SWITCHED_FROM_MONTHLY_TO_ANNUAL_PLAN = 503

    event_type: int = models.PositiveSmallIntegerField()