What is a Third-Party Integration?

Most business software needs to interoperate with tools it did not build, such as a CRM, an accounting system, a calendar, or a messaging platform. Integrations bridge that gap through mechanisms like REST APIs with OAuth-based authorization, webhooks that push events in real time, or a managed connector layer that normalizes many providers behind one interface. The integration typically needs its own credential lifecycle for tokens, scopes, and refresh, its own error handling for the other system's rate limits and downtime, and a mapping between each vendor's data model and the host application's. The quality of an integration layer determines how much of a platform's value users actually realize, since most workflows span more than one tool. Poorly built integrations silently drift out of sync or fail on token expiry; well-built ones handle reauthorization, retries, and partial failures gracefully so the user never notices the seam between systems.