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calcom/packages/app-store/_utils/stripe.ts

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+import { Prisma } from "@prisma/client";
+import Stripe from "stripe";
+
+import { HttpError } from "@calcom/lib/http-error";
+import prisma from "@calcom/prisma";
+
+export async function getStripeCustomerIdFromUserId(userId: number) {
+  // Get user
+  const user = await prisma.user.findUnique({
+    where: {
+      id: userId,
+    },
+    select: {
+      email: true,
+      name: true,
+      metadata: true,
+    },
+  });
+
+  if (!user?.email) throw new HttpError({ statusCode: 404, message: "User email not found" });
+
+  const customerId = await getStripeCustomerId(user);
+
+  return customerId;
+}
+
+const userType = Prisma.validator<Prisma.UserArgs>()({
+  select: {
+    email: true,
+    metadata: true,
+  },
+});
+
+export type UserType = Prisma.UserGetPayload<typeof userType>;
+/** This will retrieve the customer ID from Stripe or create it if it doesn't exists yet. */
+export async function getStripeCustomerId(user: UserType): Promise<string> {
+  let customerId: string | null = null;
+
+  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 customersResponse = await stripe.customers.list({
+      email: user.email,
+      limit: 1,
+    });
+    if (customersResponse.data[0]?.id) {
+      customerId = customersResponse.data[0].id;
+    } else {
+      /* Creating customer on Stripe and saving it on prisma */
+      const customer = await stripe.customers.create({ email: user.email });
+      customerId = customer.id;
+    }
+
+    await prisma.user.update({
+      where: {
+        email: user.email,
+      },
+      data: {
+        metadata: {
+          ...(user.metadata as Prisma.JsonObject),
+          stripeCustomerId: customerId,
+        },
+      },
+    });
+  }
+
+  return customerId;
+}
+
+const stripePrivateKey = process.env.STRIPE_PRIVATE_KEY || "";
+export const stripe = new Stripe(stripePrivateKey, {
+  apiVersion: "2020-08-27",
+});