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Payment Platforms

WeChat Pay APIv3 Integration in Practice: Signing, Callback Verification, and Idempotency

2026-11-09 16IDC

WeChat Pay APIv3 rewrote the signing algorithm, the certificate model, and callback encryption all at once, so patterns carried over from v2 fail reliably. This walkthrough follows the real integration order: what each of the three key materials does, how to compute a request signature, how to verify and decrypt callbacks, which of the four payment products to pick, and how to build the order state machine and idempotency.

Payment Platforms

Implementing a Multi-Channel Payment Callback Framework: Unified Entry, Verify Adapters, and Compensation

2026-11-09 16IDC

Write one callback endpoint for the first channel and it is thirty lines. Copy it for the second. By the third the code has spiraled: verification logic scattered, response formats diverging, idempotency reimplemented three ways, and lost notifications untraceable. This article lays out a reusable framework with a unified entry point, verify adapters, an idempotency middle layer, and scheduled query compensation.

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