REST Track

Why carrier API integrations fail in production and what patterns separate reliable systems from brittle ones.

Understand which HTTP methods are safe and idempotent, and why this matters for retry logic in carrier integrations.

Master carrier API authentication patterns, essential headers, and correlation ID strategies for debugging.

Learn to map carrier error responses to your domain, and use RFC 9457 Problem Details for consistent error handling.

Handle paginated carrier responses and implement webhook receivers for tracking updates.

Use idempotency keys, client references, and replay-safe lookup patterns to prevent duplicate carrier writes.

Separate timeout types, identify ambiguous writes, and recover without guessing what the carrier actually did.

Honor carrier quotas, absorb bursts safely, and keep internal queues from turning throttling into an outage.

Handle partial label creation, bulk workflows, and compensation steps without corrupting internal state.

Verify webhook authenticity, reject replays, and survive out-of-order carrier events.

Use traces, health checks, and operational runbooks to separate carrier outages from your own integration failures.