Integrate Midtrans Payment Gateway

[fadilsflow]

Integrate Midtrans as the primary payment gateway to enable product purchases. This integration should support basic checkout and payment confirmation for MVP.

Scope (MVP)

• Create payment transaction via Midtrans Snap API
• Support one-time payment for digital products
• Handle payment callback / webhook from Midtrans
• Update order status on successful payment
• Store basic transaction data

Out of Scope (Future)

• Subscription / recurring payments
• Refund & chargeback handling
• Promo / installment / paylater logic
• Multi-gateway support

Acceptance Criteria

• User can initiate checkout and receive Midtrans payment page
• Successful payment updates order status to paid
• Failed or expired payment updates order status accordingly
• Webhook endpoint securely verifies Midtrans signature
• Payment flow works without user authentication

Notes

Use Midtrans sandbox for development.
Design order and payment schema to support future gateways.