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A sandbox for the third-party APIs you depend on. Built from the provider's spec, it fails on purpose, and it replays the exact failure production hit.
Payment authorization switch in Core Java 17 with no frameworks: custom ISO 8583 codec, bounded thread pool, idempotent duplicate handling, circuit breaker, and a JavaScript demo
PostgreSQL settlement and chargeback tracking with a trigger-enforced dispute lifecycle and database-written audit log, plus a JWT-secured Java API, a JavaScript dashboard and security-gated CI.