Reliable REST API integrations: errors, webhooks and retries

How to build API integrations that cope with timeouts, duplicates, delayed webhooks and third-party outages. This guide explains the practical decisions behind it and what those decisions mean for the people using and operating the product.

Assume every network request can fail

Connections time out, providers return errors and responses can be lost after the remote action succeeds. Integration design must handle uncertainty rather than treating failure as exceptional.

Retry only suitable operations

Temporary failures may recover with exponential backoff, but blindly repeating a payment or creation can duplicate it. Idempotency keys and status checks make retries safer.

Verify and queue webhooks

Validate signatures, record receipt quickly and process work in a queue. Providers may deliver the same event several times or send events out of order.

Reconcile important records

Periodic comparison catches events missed during outages and confirms both systems agree. This matters for payments, stock and fulfilment where silent drift has a real cost.

Make failures operationally visible

Store attempt history, alert after sensible thresholds and provide controlled replay tools. Support teams need context and recovery actions, not only a generic error notification.

Explore our Rest Apis technology page or discuss the requirement with Noviom Labs.