UnionPay and QuickPass Integration: Channel Messages, Signing, and Reconciliation Files
UnionPay is unavoidable for many enterprise and offline scenarios, but its integration experience differs sharply from Alipay and WeChat Pay: form-style key=value messages, certificate-based signing, separate front-end and back-end notifications, and reconciliation through downloaded files. This article follows the real UnionPay channel integration order step by step.