What is API Integration?
API integration is making two or more software systems exchange data and trigger actions through their APIs (application programming interfaces) — the structured access points software exposes for other software. It's how a website talks to a CRM, a store talks to a shipping carrier, or an app talks to a payment provider.
Last updated 2026-07-20 · Flowmatix
What an API actually is
An API is a contract: 'send a request shaped like this, get a response shaped like that.' Because the contract is stable and documented, systems from different vendors can cooperate reliably — which is why nearly every modern business tool exposes one.
Integration patterns
Most business integrations are one of three shapes: real-time sync (a webhook fires the moment something happens), scheduled sync (systems reconcile every N minutes), or on-demand lookup (fetch fresh data when a user needs it). Choosing the right shape matters more than the tools — real-time everywhere is expensive; nightly-everything feels broken.
What makes integrations fragile
The failure points are predictable: APIs change versions, rate limits throttle bursts, and duplicate or conflicting records emerge without clear ownership rules. Good integration work handles errors loudly, retries safely, and defines which system wins a conflict — the difference between plumbing you forget and plumbing that pages you at night.
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