fix: migrate billing to RR7

packages/lib/server-only/user/create-billing-portal.ts

@@ -0,0 +1,22 @@
+import type { User } from '@prisma/client';
+
+import { getStripeCustomerByUser } from '@documenso/ee/server-only/stripe/get-customer';
+import { getPortalSession } from '@documenso/ee/server-only/stripe/get-portal-session';
+import { IS_BILLING_ENABLED, NEXT_PUBLIC_WEBAPP_URL } from '@documenso/lib/constants/app';
+
+export type CreateBillingPortalOptions = {
+  user: Pick<User, 'id' | 'customerId' | 'email' | 'name'>;
+};
+
+export const createBillingPortal = async ({ user }: CreateBillingPortalOptions) => {
+  if (!IS_BILLING_ENABLED()) {
+    throw new Error('Billing is not enabled');
+  }
+
+  const { stripeCustomer } = await getStripeCustomerByUser(user);
+
+  return getPortalSession({
+    customerId: stripeCustomer.id,
+    returnUrl: `${NEXT_PUBLIC_WEBAPP_URL()}/settings/billing`,
+  });
+};