#webhook

Diagnose cases where provider cancellation succeeded but local booking state stayed stale across webhook, persistence, ordering and reconciliation layers.

Diagnose missing provider webhooks across delivery, signature, endpoint, queue and reconciliation layers.

Handle duplicate, delayed and out-of-order webhook events safely with deduplication, replay rules and idempotent state transitions.

Design webhook, polling and reconciliation roles for travel booking systems, including duplicate, out-of-order and missing-event recovery.