Integration Testing

Overview

Integration Testing verifies that two or more real or representative components work together through their documented boundaries. It sits between isolated unit tests and full production validation, and should not rely only on a mock server when provider behavior or network timing materially affects the result.

The main risks include test data leaking into production, unrealistic mocks, flaky timing, missing failure scenarios, and false confidence from happy-path tests. For payment integrations it covers API requests, authentication, callbacks, state changes, persistence, and downstream business behavior.

In production, teams should define ownership and apply sandbox environments, deterministic fixtures, contract tests, callback simulation, negative cases, idempotency cases, and cleanup procedures. A failed Integration Testing operation should preserve the original order or payment identity before any retry or operator correction.

Useful measures include test pass rate, flaky-test rate, escaped integration defects, scenario coverage, and environment reset failures. Integration Testing is closely connected to Mock Server, Sandbox Endpoint, and Webhook Testing. The Integration Testing release boundary should state supported platform versions, configuration ownership, upgrade behavior, and production rollback conditions.

For Integration Testing, contract tests should cover the host platform, provider API, asynchronous events, and the resulting order or payment state. A Integration Testing deployment should keep test and production credentials separate and document customization that can alter default behavior.

Operational evidence for Integration Testing should connect the installed version and configuration to the provider request, response, event, and final business outcome. Monitoring for Integration Testing should separate host-platform errors, provider API failures, callback delays, and mismatched business records.