API integration
Definition
An API integration connects two systems through their programming interfaces so data moves automatically and reliably. It is the stable alternative to manual re-entry, CSV exchange and interface robots, and it is the backbone of every serious automation.
The engineering work is in the details: authentication, rate limits, error handling, retries, field mapping and reconciliation when both sides disagree.
A good integration is observable — you can see what was transferred, when, and what failed.
In practice
- Authentication, rate limits and error handling define reliability
- Field mapping and reconciliation prevent silent data drift
- Every transfer is logged and replayable
Related terms
- ERP integrationERP integration connects operational software and AI agents to the system of record for orders, articles, customers, stock and accounting, so automation reads current data and writes results back into the books instead of into a parallel spreadsheet.
- Robotic process automation (RPA)Robotic process automation uses software robots that operate existing applications through their user interface — clicking, typing, copying between screens. It automates rule-based routine work without changing the underlying systems, and breaks when those interfaces change.
- Legacy systemA legacy system is business-critical software that is technically outdated but still runs core operations. It typically lacks modern interfaces, which makes it the main constraint — and often the main cost driver — in automation projects.