APIs power modern business - connecting your website, CRM, payment gateways, and internal tools. Doing it right means consistent error handling, retries, and clear documentation.

Use authentication (OAuth, API keys) properly, validate inputs, and log failures for debugging. Version your APIs so changes don't break existing integrations. Consider rate limits and caching to protect both sides.

Webhooks and event-driven flows keep systems in sync without constant polling. Design for failure: timeouts, idempotency, and dead-letter queues prevent small outages from becoming data messes.

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