When a booking fails, you need to know which supplier, which call and why — in minutes. Correlation IDs, safe request logging, per-supplier metrics, tracing and alerting that make multi-supplier travel platforms debuggable.
Webhooks look simple until a partner misses an event. How to design webhook delivery with outbox patterns, retries with backoff, signatures, ordering, replay and monitoring that partners can trust.
Timeouts and retries are normal in distributed systems. Idempotency keys, state machines and reconciliation make booking and payment flows safe to retry, without duplicate charges or orphaned reservations.
