API Capability demo · reference build Deliverable
E-commerce backend API & payment integration
Products, orders and payments in one chain — WeChat Pay and Alipay integrated, with OpenAPI docs and load tests.
This page is a capability demo and reference build. The UI is illustrative — not a delivered artifact for a specific client.
Background
The scary part of an e-commerce backend isn’t the CRUD — it’s payment-callback idempotency, order state-machine consistency, and oversell under concurrency. None show up in a demo, yet they decide whether production loses money.
How we do it
01 RESTful API: model product/order/payment resources, OpenAPI spec first
02 Payment integration: WeChat Pay + Alipay, idempotent callbacks, reconciliation, refund loop
03 Order state machine: consistent placed/paid/shipped/done/refunded, oversell-proof
04 Load tests & docs: interface load-test report + interactive API docs
What you get
- ✓ Product/order/payment REST API source
- ✓ WeChat Pay / Alipay integration with idempotent callbacks
- ✓ Interactive OpenAPI docs and Postman collection
- ✓ Load-test report + deploy scripts
Outcomes & acceptance
- Acceptance standard: idempotent payment callbacks — duplicate notices don’t double-charge/ship
- Consistent order state machine, no oversell under concurrency
- APIs pass load tests with QPS and P99 baselines
- OpenAPI docs share a source with the code, front/back aligned
Related service
Backend API & microservices Service details & pricing →Related reading
Want a system like this? Tell us your goal — feasibility within 24h
Proposal and fixed quote are free. Contract on approval, invoice on acceptance, warranty included.