Introduced LoggerMiddleware for HTTP request logging. Refactored handler
methods to return http.HandlerFunc for improved composability. Updated
route registration and tests to use new handler signatures.
- Integrate Stripe Go SDK and implement a checkout service for creating
Stripe Checkout sessions for a demo product.
- Add request/response types for checkout sessions.
- Create HTTP handler for /api/checkout to initiate sessions via POST.
- Provide comprehensive unit tests for Stripe client and web handler.
- Wire Stripe-backed endpoint in server setup.
