API Integration Patterns for Enterprise Systems

Choosing the right integration pattern saves pain later. Use synchronous APIs when the caller needs an immediate response (e.g., validation, lookup). Use async (queues, webhooks, events) when work can be done in the background or when systems have different availability. Always plan for failures: retries with backoff, idempotency where needed, and clear error handling and logging. Document contracts and version them so changes don't break consumers. In enterprise environments, consider middleware or an integration layer to centralize auth, routing, and monitoring. Good integration design is as much about operations and governance as it is about the API itself.