stripe: Change stripe email on the upgrade page if available.

corporate/lib/stripe.py

@@ -671,7 +671,7 @@ class SponsorshipRequestSessionSpecificContext(TypedDict):
 
 class UpgradePageContext(TypedDict):
     customer_name: str
-    email: str
+    stripe_email: str
     exempt_from_license_number_check: bool
     free_trial_end_date: str | None
     is_demo_organization: bool
@@ -2728,9 +2728,17 @@ class BillingSession(ABC):
                 )
 
         flat_discount, flat_discounted_months = self.get_flat_discount_info(customer)
+
+        # Invoice is sent to stripe email.
+        stripe_email = customer_specific_context["email"]
+        if customer is not None and customer.stripe_customer_id is not None:
+            stripe_customer = stripe_get_customer(customer.stripe_customer_id)
+            if type(stripe_customer.email) is str:
+                stripe_email = stripe_customer.email
+
         context: UpgradePageContext = {
             "customer_name": customer_specific_context["customer_name"],
-            "email": customer_specific_context["email"],
+            "stripe_email": stripe_email,
             "exempt_from_license_number_check": exempt_from_license_number_check,
             "free_trial_end_date": free_trial_end_date,
             "is_demo_organization": customer_specific_context["is_demo_organization"],

corporate/tests/test_stripe.py

@@ -2798,14 +2798,23 @@ class StripeTest(StripeTestCase):
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response["Location"], "http://zulip.testserver/sponsorship")
 
+        stripe_customer_id = "cus_123"
         # Avoid contacting stripe as we only want to check redirects here.
-        with patch(
+        with (
+            patch(
                 "corporate.lib.stripe.customer_has_credit_card_as_default_payment_method",
                 return_value=False,
+            ),
+            patch(
+                "stripe.Customer.retrieve",
+                return_value=Mock(id=stripe_customer_id, email="test@zulip.com"),
+            ),
         ):
             user.realm.plan_type = Realm.PLAN_TYPE_LIMITED
             user.realm.save()
-            customer = Customer.objects.create(realm=user.realm, stripe_customer_id="cus_123")
+            customer = Customer.objects.create(
+                realm=user.realm, stripe_customer_id=stripe_customer_id
+            )
             response = self.client_get("/upgrade/")
             self.assertEqual(response.status_code, 200)
 

templates/corporate/billing/upgrade.html

@@ -42,7 +42,7 @@
                         {% if is_free_trial_invoice_expired_notice %}
                         Your free trial of {{ free_trial_invoice_expired_notice_page_plan_name }} has expired.
                         <a href="{{ pay_by_invoice_payments_page }}" target="_blank" rel="noopener noreferrer">An invoice</a>
-                        for ${{ scheduled_upgrade_invoice_amount_due }} has been sent to <b>{{email}}</b>.
+                        for ${{ scheduled_upgrade_invoice_amount_due }} has been sent to <b>{{ stripe_email }}</b>.
                         To reactivate your {{ free_trial_invoice_expired_notice_page_plan_name }} plan, please pay the amount due.
                         Once the invoice has been paid, reload this page to see billing details.
                         {% else %}
@@ -53,7 +53,7 @@
                         {% if scheduled_upgrade_invoice_amount_due %}
                         for ${{ scheduled_upgrade_invoice_amount_due }}
                         {% endif %}
-                        has been sent to <b>{{email}}</b>.
+                        has been sent to <b>{{ stripe_email }}</b>.
                         To complete the plan upgrade process, please pay the amount due. Once the invoice has been paid, reload this page to see billing details.
                         {% endif %}
                     </div>
@@ -75,7 +75,7 @@
                         {% if page_params.free_trial_days %}
                         <div class="not-editable-realm-field">
                             {% if page_params.setup_payment_by_invoice %}
-                            An invoice will immediately be sent to <b>{{email}}</b>. To ensure continuous access to Zulip Basic,
+                            An invoice will immediately be sent to <b>{{ stripe_email }}</b>. To ensure continuous access to Zulip Basic,
                             please pay your invoice before your free trial ends on {{ free_trial_end_date }}.
                             {% else %}
                             Add a credit card to start your <b>{{ page_params.free_trial_days }}-day free trial</b> of
@@ -346,10 +346,10 @@
                     <br />
                     {% if page_params.free_trial_days %}
                     <br />
-                    Starting free trial will immediately send an invoice to <b>{{email}}</b>.
+                    Starting free trial will immediately send an invoice to <b>{{ stripe_email }}</b>.
                     This is your last chance to update the billing information on your invoice.
                     {% else %}
-                    Your invoice will be sent to <b>{{email}}</b>.
+                    Your invoice will be sent to <b>{{ stripe_email }}</b>.
                     {% endif %}
                 </p>
             </main>