API Integration

Overview

API Integration is the implementation that connects one system to another through API calls, events, and shared operational rules. It is used to automate data exchange and business workflows across independently managed systems. It differs from simple connectivity, because a reliable integration also preserves meaning, state, security, and failure handling.

A typical implementation works as follows: Teams map identifiers and statuses, configure authentication, send calls, receive callbacks, handle asynchronous states, and reconcile the final outcome. Compatibility testing for API Integration should include older supported versions, custom extensions, background jobs, and asynchronous callbacks.

Common risks include duplicate delivery and semantic mismatch. Important failure modes include duplicate delivery, semantic mismatch, expired credentials, breaking changes, partial completion, and weak ownership. These failures can create silent operational gaps.

Core controls require teams to document mappings, use idempotency and correlation, test failures, monitor dependencies, version contracts, and assign operational ownership. Operational evidence for API Integration should connect the installed version and configuration to the provider request, response, event, and final business outcome.

Operational evidence should include integration version, systems, credential reference, mapping version, request and event IDs, state, and reconciliation status. API Integration should be documented alongside API Connector, API Contract, and Callback.

A failed API Integration operation should preserve the original order or payment identity before any retry or operator correction. The API Integration release boundary should state supported platform versions, configuration ownership, upgrade behavior, and production rollback conditions. For API Integration, contract tests should cover the host platform, provider API, asynchronous events, and the resulting order or payment state.