The Prince Academy株式会社 | Common Pitfalls and Troubleshooting | Implementing Basic Payment Flows with Stripe Checkout | Stripe for Next.js: A Developer's Guide to Seamless Payments

As you integrate Stripe Checkout into your Next.js application, you'll likely encounter a few common hurdles. This section aims to equip you with the knowledge to diagnose and resolve these issues quickly, ensuring a smooth payment experience for your users.

Incorrect Stripe API Keys:

This is the most frequent culprit. Ensure you are using your secret key on the server-side (e.g., in your API routes) and your publishable key on the client-side. Mixing them up or using test keys in production (or vice-versa) will lead to authentication errors. Always verify your .env.local file and ensure the correct keys are being loaded.

import Stripe from 'stripe';

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY, {
  apiVersion: '2023-10-16',
});

import { loadStripe } from '@stripe/stripe-js';

const stripePromise = loadStripe(process.env.NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY);

CORS Issues with API Routes:

When your client-side code tries to communicate with your Next.js API routes (e.g., to create a checkout session), Cross-Origin Resource Sharing (CORS) policies can sometimes interfere. Ensure your API routes are configured to allow requests from your frontend domain, especially during development.

// Example in your API route handler (pages/api/create-checkout-session.js)
import NextCors from 'nextjs-cors';

async function handler(req, res) {
  await NextCors(req, res, {
    origin: '*', // Or your specific frontend origin
    methods: ['GET', 'HEAD', 'OPTIONS', 'POST', 'PUT', 'PATCH', 'DELETE'],
    credentials: true,
  });

  // ... your Stripe logic here
}

// Example in your API route handler (pages/api/create-checkout-session.js) import NextCors from 'nextjs-cors'; async function handler(req, res) { await NextCors(req, res, { origin: '*', // Or your specific frontend origin methods: ['GET', 'HEAD', 'OPTIONS', 'POST', 'PUT', 'PATCH', 'DELETE'], credentials: true, }); // ... your Stripe logic here }