agency/api/stripe-webhook.ts

import { VercelRequest, VercelResponse } from '@vercel/node';
import Stripe from 'stripe';

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

const endpointSecret = process.env.STRIPE_WEBHOOK_SECRET || 'PURGED';

export default async function handler(req: VercelRequest, res: VercelResponse) {
  if (req.method !== 'POST') {
    return res.status(405).json({ error: 'Method not allowed' });
  }

  const sig = req.headers['stripe-signature'] as string;
  let event: Stripe.Event;

  try {
    // Verify webhook signature
    const rawBody = JSON.stringify(req.body);
    event = stripe.webhooks.constructEvent(rawBody, sig, endpointSecret);
  } catch (err: any) {
    console.error('Webhook signature verification failed:', err.message);
    return res.status(400).send(`Webhook Error: ${err.message}`);
  }

  // Handle the event
  switch (event.type) {
    case 'checkout.session.completed':
      const session = event.data.object as Stripe.Checkout.Session;
      
      // Process the successful payment
      console.log('Payment successful:', {
        sessionId: session.id,
        customerId: session.customer,
        amount: session.amount_total,
        metadata: session.metadata
      });

      // Here you would typically:
      // 1. Update user credits in your database
      // 2. Send confirmation email
      // 3. Log the transaction
      
      // For now, we'll just log it
      break;

    case 'payment_intent.succeeded':
      const paymentIntent = event.data.object as Stripe.PaymentIntent;
      console.log('Payment intent succeeded:', paymentIntent.id);
      break;

    case 'payment_intent.payment_failed':
      const failedPayment = event.data.object as Stripe.PaymentIntent;
      console.log('Payment failed:', failedPayment.id);
      break;

    default:
      console.log(`Unhandled event type ${event.type}`);
  }

  // Return a 200 response to acknowledge receipt of the event
  res.status(200).json({ received: true });
}