Payment Integration (Stripe) Guide

Implement Stripe payment processing for [APPLICATION TYPE].

Payment type: [ONE-TIME / SUBSCRIPTION / METERED / MARKETPLACE]
Framework: [NEXT.JS / EXPRESS / DJANGO / RAILS]

Provide:
1. **Stripe Dashboard Setup**: Products, prices, webhook endpoints
2. **Checkout Flow**: Stripe Checkout or custom Elements — decision and implementation
3. **Backend Implementation**: Create customer, create subscription/payment intent, handle webhooks
4. **Webhook Handler**: All events to listen for with handler code
5. **Customer Portal**: Self-service billing management setup
6. **Error Handling**: Card declined, authentication required, payment failed — user-friendly handling
7. **Testing**: Test card numbers, webhook testing with Stripe CLI
8. **Security**: PCI compliance, no raw card data, secure key management
9. **Subscription Lifecycle**: Trial, active, past due, cancelled — handle all states
10. **Go-Live Checklist**: Everything to verify before switching from test to live mode

Implement Stripe payment processing for [APPLICATION TYPE].

Payment type: [ONE-TIME / SUBSCRIPTION / METERED / MARKETPLACE]
Framework: [NEXT.JS / EXPRESS / DJANGO / RAILS]

Provide:
1. **Stripe Dashboard Setup**: Products, prices, webhook endpoints
2. **Checkout Flow**: Stripe Checkout or custom Elements — decision and implementation
3. **Backend Implementation**: Create customer, create subscription/payment intent, handle webhooks
4. **Webhook Handler**: All events to listen for with handler code
5. **Customer Portal**: Self-service billing management setup
6. **Error Handling**: Card declined, authentication required, payment failed — user-friendly handling
7. **Testing**: Test card numbers, webhook testing with Stripe CLI
8. **Security**: PCI compliance, no raw card data, secure key management
9. **Subscription Lifecycle**: Trial, active, past due, cancelled — handle all states
10. **Go-Live Checklist**: Everything to verify before switching from test to live mode