fix(stripe): prevent duplicate customers (#3459)

* prevent duplicate stripe customer

* prevent duplicate stripe customer

packages/stripe/src/index.ts

@@ -239,19 +239,26 @@ export const stripe = <O extends StripeOptions>(options: O) => {
 
 				if (!customerId) {
 					try {
-						const stripeCustomer = await client.customers.create(
-							{
+						// Try to find existing Stripe customer by email
+						const existingCustomers = await client.customers.list({
+							email: user.email,
+							limit: 1,
+						});
+
+						let stripeCustomer = existingCustomers.data[0];
+
+						if (!stripeCustomer) {
+							stripeCustomer = await client.customers.create({
 								email: user.email,
 								name: user.name,
 								metadata: {
 									...ctx.body.metadata,
 									userId: user.id,
 								},
-							},
-							{
-								idempotencyKey: generateRandomString(32, "a-z", "0-9"),
-							},
-						);
+							});
+						}
+
+						// Update local DB with Stripe customer ID
 						await ctx.context.adapter.update({
 							model: "user",
 							update: {
@@ -264,6 +271,7 @@ export const stripe = <O extends StripeOptions>(options: O) => {
 								},
 							],
 						});
+
 						customerId = stripeCustomer.id;
 					} catch (e: any) {
 						ctx.context.logger.error(e);

packages/stripe/src/stripe.test.ts

@@ -817,4 +817,27 @@ describe("stripe", async () => {
 		expect(upgradeRes.error).toBeDefined();
 		expect(upgradeRes.error?.message).toContain("already subscribed");
 	});
+
+	it("should only call Stripe customers.create once for signup and upgrade", async () => {
+		const userRes = await authClient.signUp.email(
+			{ ...testUser, email: "single-create@email.com" },
+			{ throw: true },
+		);
+
+		const headers = new Headers();
+		await authClient.signIn.email(
+			{ ...testUser, email: "single-create@email.com" },
+			{
+				throw: true,
+				onSuccess: setCookieToHeader(headers),
+			},
+		);
+
+		await authClient.subscription.upgrade({
+			plan: "starter",
+			fetchOptions: { headers },
+		});
+
+		expect(mockStripe.customers.create).toHaveBeenCalledTimes(1);
+	});
 });