Screening API Latency and Resilience Patterns for Production Payments
Compliance APIs sit on the critical path. Architecture choices here determine whether outages become policy breaches.
Treat screening as critical infrastructure
Define SLOs aligned with product flows: onboarding, authorisation, and batch remediation each have different tolerance for delay.
Instrument end-to-end latency, not only vendor response times, so you detect regressions introduced by your own middleware.
Retry semantics that respect idempotency
Use request fingerprints or idempotency keys so transient retries do not duplicate decisions or corrupt audit logs.
Backoff strategies should distinguish rate limits from hard failures.
Documented degradation policies
Regulators expect a written answer to: what happens if screening is unavailable? Your policy should define halting versus queueing, maximum hold durations, and manual escalation paths.
Run game-day exercises twice yearly; evidence of testing matters as much as the runbook itself.