Zomars/cal 798 issue with billing portal (#1392)

* Uses stripeCustomerId from used metadata in billing portal

* Uses stripeCustomerId from used metadata in billing portal

# Conflicts:
#	ee/pages/api/integrations/stripepayment/portal.ts

ee/pages/api/integrations/stripepayment/portal.ts

@@ -1,3 +1,4 @@
+import { Prisma } from "@prisma/client";
 import type { NextApiRequest, NextApiResponse } from "next";
 
 import stripe from "@ee/lib/stripe/server";
@@ -23,6 +24,7 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
       select: {
         email: true,
         name: true,
+        metadata: true,
       },
     });
 
@@ -31,26 +33,29 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
         message: "User email not found",
       });
 
-    /**
-     * TODO: We need to find a better way to get our users customer id from Stripe,
-     * since the email is not an unique field in Stripe and we don't save them
-     * in our DB as of now.
-     **/
-    const customersReponse = await stripe.customers.list({
-      email: user?.email || "",
-      limit: 1,
-    });
+    let customerId = "";
 
-    const [customer] = customersReponse.data;
+    if (user?.metadata && typeof user.metadata === "object" && "stripeCustomerId" in user.metadata) {
+      customerId = (user?.metadata as Prisma.JsonObject).stripeCustomerId as string;
+    } else {
+      /* We fallback to finding the customer by email (which is not optimal) */
+      const customersReponse = await stripe.customers.list({
+        email: user.email,
+        limit: 1,
+      });
+      if (customersReponse.data[0]?.id) {
+        customerId = customersReponse.data[0].id;
+      }
+    }
 
-    if (!customer?.id)
+    if (!customerId)
       return res.status(404).json({
         message: "Stripe customer id not found",
       });
 
     const return_url = `${process.env.BASE_URL}/settings/billing`;
     const stripeSession = await stripe.billingPortal.sessions.create({
-      customer: customer.id,
+      customer: customerId,
       return_url,
     });