Api-design

How API contract testing catches breaking request, response, error, and schema changes before release with OpenAPI diffs, consumer examples, and CI compatibility checks.

How to choose database transaction boundaries in backend APIs so writes stay atomic without holding locks across external calls, slow work, retries, or post-commit side effects.

How to handle webhook idempotency and retries in production with durable receipt records, atomic deduplication, fast acknowledgements, idempotent workers, and replay-safe side effects.

A practical guide to API integration testing with real request boundaries, auth, persistence checks, failure cases, idempotency, concurrency, and response contracts.

How to design API idempotency keys for retries, duplicate POST requests, payload mismatch, TTL, in-progress requests, and safe response replay.