feat(backend): harden Payment Session Validator and Merchant Settings… - #1588
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… & API Key Service - Retry transient payment session persistence failures with full-jitter exponential backoff; never retry validation/constraint errors, and treat a duplicate key on a retry as an already-persisted session (emdevelopa#1449) - Add distributed per-(merchant, Idempotency-Key) session lock using Redis SET NX PX with compare-and-delete release, in-process fallback, and an idempotency replay check inside the lock; concurrent twins get 409 (emdevelopa#1450) - Add integration and stress test suite for the session pipeline, including multi-node concurrency and fault injection (emdevelopa#1451) - Sanitize merchant settings/API key payloads (prototype-pollution keys, control chars, size limits) and enforce strict schemas, webhook header rules, and bounded API key expiry, with service-level guards (emdevelopa#1482) Closes emdevelopa#1449 Closes emdevelopa#1450 Closes emdevelopa#1451 Closes emdevelopa#1482 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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…chant-settings-hardening
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… & API Key Service
Closes #1449
Closes #1450
Closes #1451
Closes #1482