fix: update stripe team member billing (#2991)

packages/lib/server-only/organisation/accept-organisation-invitation.ts

@@ -1,7 +1,12 @@
+import {
+  assertMemberCountWithinCap,
+  syncMemberCountWithStripeSeatPlan,
+} from '@documenso/ee/server-only/stripe/update-subscription-item-quantity';
 import { prisma } from '@documenso/prisma';
 import type { OrganisationGroup, OrganisationMemberRole } from '@prisma/client';
-import { OrganisationGroupType, OrganisationMemberInviteStatus } from '@prisma/client';
+import { OrganisationGroupType, OrganisationMemberInviteStatus, SubscriptionStatus } from '@prisma/client';
 
+import { IS_BILLING_ENABLED } from '../../constants/app';
 import { AppError, AppErrorCode } from '../../errors/app-error';
 import { jobs } from '../../jobs/client';
 import { generateDatabaseId } from '../../universal/id';
@@ -22,6 +27,13 @@ export const acceptOrganisationInvitation = async ({ token }: AcceptOrganisation
       organisation: {
         include: {
           groups: true,
+          organisationClaim: true,
+          subscription: true,
+          members: {
+            select: {
+              id: true,
+            },
+          },
         },
       },
     },
@@ -66,6 +78,35 @@ export const acceptOrganisationInvitation = async ({ token }: AcceptOrganisation
     return;
   }
 
+  const newMemberCount = organisation.members.length + 1;
+
+  // Billing occurs when a user accepts an invite.
+  // Assert that the new member count is within the cap and sync the seat plan with Stripe.
+  if (IS_BILLING_ENABLED()) {
+    const { subscription, organisationClaim } = organisation;
+
+    // A canceled subscription cannot have its seat quantity updated in Stripe,
+    // and an organisation with lapsed billing should not gain new members.
+    // Throw a deliberate error so the invite page can render an accurate
+    // message instead of an opaque Stripe failure.
+    if (subscription && subscription.status === SubscriptionStatus.INACTIVE) {
+      throw new AppError('SUBSCRIPTION_INACTIVE', {
+        message: 'The organisation subscription is inactive',
+      });
+    }
+
+    // Organisations can exist without a subscription (e.g. after being
+    // downgraded to the free plan). The claim cap remains authoritative in
+    // that case, surfacing LIMIT_EXCEEDED instead of an opaque "subscription
+    // not found" error.
+    await assertMemberCountWithinCap(subscription, organisationClaim, newMemberCount);
+
+    if (subscription) {
+      await syncMemberCountWithStripeSeatPlan(subscription, organisationClaim, newMemberCount, 'grow');
+    }
+  }
+
+  // Todo: Logging
   await addUserToOrganisation({
     userId: user.id,
     organisationId: organisation.id,