Niu Liu

Aug 12, 2026 · Backend Development

WeChat Pay Service Provider: Entity-First Payment Routing for Multi-Store Systems

This article details a production-grade WeChat Pay service provider integration for multi-store, multi-entity scenarios, covering domain modeling, versioned payment routing, sub-merchant onboarding state machines, cashier configuration layers, callback verification, refund snapshot isolation, three-level reconciliation, and a 10-item launch checklist.