Files
Crussell/backend
popertotsandSisyphus e9b34d0ad6 fix: dev-mock/prod parity + fail-closed config gates — 402 verification, cnon:sca binding validation, refund reconcile parity, SNAPSHOT_ENC_KEY fail-closed, webhook config gates, access-token startup validation, ClientIP validation
- mock: 400->402 for CARD_DECLINED_VERIFICATION_REQUIRED, cnon:sca- tokenize-result binding validated (prefix/amount/deny), RefundPayment exact-amount reconcile parity, ReplayPaymentByKey snapshot sanity, verify_mock_ legacy widening removed, listRefunds zero-time omits begin_time
- main.go: SNAPSHOT_ENC_KEY log.Fatalf in non-mock, webhook key-set-URL-unset log.Fatalf, SQUARE_ACCESS_TOKEN/LOCATION startup validation, empty-env base URL matches 2FA production interpretation
- mw: ClientIP rejects garbage/comma/port XFF values, documented trusted-proxy requirement

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
2026-08-22 00:34:51 +01:00
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