Stripe Payments in Next.js 15 The Setup I Use for Every SaaS
Every SaaS project eventually needs the same thing, a way to charge people. Stripe handles the actual payment processing, but wiring it into Next.js correctly, especially getting webhooks right, is where most of the real work sits. Here is the setup I use for checkout and subscriptions in every SaaS project. 1. The Stripe Client // lib/stripe.ts import Stripe from ' stripe ' ; export const stripe…
In every SaaS project, a crucial requirement is implementing a payment processing system. Stripe is a widely-used solution for handling payment processing, but setting it up properly with Next.js, particularly managing webhooks, poses significant challenges. The following outlines a streamlined setup for checkout and subscriptions in a SaaS project using Stripe.
1. Implementing the Stripe Client: A single Stripe client is imported wherever necessary. This client is initialized with the environment variable STRIPE_SECRET_KEY and includes the API version and TypeScript support.
2. Creating a Checkout Session: The checkout process begins with a Server Action that creates a Stripe Checkout Session and redirects the user to Stripe's hosted payment page. This action checks if the user is logged in, and if not, redirects them to the login page. The function then creates a new session through Stripe's API, specifying the subscription mode, payment method types, line items, customer email, success and cancel URLs, and user metadata. The user is then redirected to the checkout session URL.
3. The Necessity of Webhooks: One of the most critical aspects often overlooked is the implementation of webhooks. While it may seem tempting to update the database directly after redirecting the user, this approach is unreliable. Redirects can fail or be interrupted, and the database never receives confirmation of a successful payment.
Webhooks, on the other hand, allow Stripe to call the server directly, providing a dependable source of truth for payment status. A POST route in the API is set up to receive Stripe webhook events, verifying the signature using the webhook secret and connecting to the database to update the user information accordingly.
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