Handle Stripe Webhook

Handle Stripe webhook events for automatic conversion recording.

Supported Events:

• checkout.session.completed - One-time purchase completed
• invoice.payment_succeeded - Subscription payment succeeded
• charge.refunded - Refund processed (negative conversion)

Metadata Requirements: Include session_id in Stripe metadata to link conversion to attribution:

// In your checkout code:
const sessionId = AIVisibility.getSessionId();

const checkout = await stripe.checkout.sessions.create({
  // ... other params
  metadata: {
    session_id: sessionId,  // Required for attribution
    query_id: "optional"     // Optional
  }
});

Response:

• 200: Event processed successfully
• 400: Invalid payload or signature
• 500: Error processing event