A2M收付链路部署skill（英文版）

A closed-source, production-grade playbook for deploying and wiring up an Alipay A2M (402 bill) pay/collect gateway on a cloud host using only the provider's in-browser WebShell (no local SSH, no plaintext private key handling). Ships a reusable payment gate (payment_gate.py) with strict verification, fail-closed behavior, and zero credential-at-rest. Covers systemd hosting, nginx subdomain reverse proxy, env-var loading (including the hidden root cause where the private key already lived in the deploy script's exports but the old systemd unit never loaded them), WebShell pitfalls, end-to-end verification, and ops red lines. For developers who want to turn their own Skill into a pay-per-call product.

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