Requests may fail during an outage after the source system has acknowledged work or before the destination has persisted it.
Use a durable queue and checkpoints, track provider request IDs, and distinguish confirmed failure from uncertain completion. Reconcile source and destination after recovery, using idempotency to replay safely without losing or duplicating records.
API engineering can design durable retries and recovery reconciliation. Informatix Systems can assess the symptoms, evidence, and next steps. Contact Informatix Systems to discuss this issue.