Multi-channel payment & reconciliation
WeChat/Alipay dual channel, HMAC-signed callbacks, unified order/refund/reconciliation endpoints; syncs with UM billing quota.
Standard REST, unified error codes and pagination.
| Method | Path | Description |
|---|---|---|
| POST | /api/pay | Initiate payment (WeChat/Alipay) |
| POST | /api/refund | Refund |
| GET | /api/order/{id} | Order query |
| POST | /api/notify | Payment callback (HMAC verified) |