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Building a SaaS with Stripe Payments
January 10, 20251 min read

Building a SaaS with Stripe Payments

A complete guide to integrating Stripe payments into your SaaS application for subscriptions and one-time payments.

SaaS
Payments

Building a successful SaaS requires a robust payment system. Stripe makes it easy to accept payments, manage subscriptions, and handle billing.

Setting Up Stripe

First, install the Stripe SDK:

npm install stripe @stripe/stripe-js

Create a Stripe instance on the server:

import Stripe from "stripe";

export const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!, {
  apiVersion: "2024-12-18.acacia",
});

Creating a Subscription

To create a subscription, you need to:

  1. Create a customer
  2. Attach a payment method
  3. Create the subscription
const subscription = await
stripe.subscriptions.
create
({
customer: customerId,
items: [{ price: priceId }],
payment_behavior: "default_incomplete",
expand: ["latest_invoice.payment_intent"],
});

Handling Webhooks

Webhooks are essential for keeping your database in sync:

export async function POST(req: Request) {
  const body = await req.text();
  const sig = req.headers.get("stripe-signature")!;

  const event = stripe.webhooks.constructEvent(body, sig, webhookSecret);

  switch (event.type) {
    case "customer.subscription.created":
      // Handle new subscription
      break;
    case "invoice.paid":
      // Handle successful payment

Best Practices

  • Always use webhooks for critical business logic
  • Store Stripe IDs in your database
  • Implement proper error handling
  • Test with Stripe CLI locally
break;
}
}