Stripe Integration

Key Files

• Webhook handler: app/api/webhooks/stripe/route.ts
• Stripe client: server/services/stripe.service.ts
• Subscription utils: shared/config/subscription.utils.ts

Webhook Events

Handle these events for subscriptions:

• checkout.session.completed - New subscription
• customer.subscription.updated - Plan changes
• customer.subscription.deleted - Cancellation
• invoice.payment_succeeded - Renewal
• invoice.payment_failed - Failed payment

Webhook Security

import Stripe from 'stripe';

const signature = request.headers.get('stripe-signature');
const event = stripe.webhooks.constructEvent(body, signature, process.env.STRIPE_WEBHOOK_SECRET);

Checkout Session

const session = await stripe.checkout.sessions.create({
  mode: 'subscription',
  customer_email: user.email,
  line_items: [{ price: priceId, quantity: 1 }],
  success_url: `${baseUrl}/success?session_id={CHECKOUT_SESSION_ID}`,
  cancel_url: `${baseUrl}/pricing`,
  metadata: { userId: user.id },
});

Credit System Pattern

1. Check credits before operation
2. Deduct credits atomically (use Supabase RPC)
3. Perform operation
4. Rollback credits on failure

Testing

Use Stripe CLI for local webhook testing:

stripe listen --forward-to localhost:3000/api/webhooks/stripe