client ID | Documentation | Esri Developer

A Client ID is an identifier associated with an application that assists with client / server OAuth 2.0 authentication for ArcGIS client APIsA Client API is a web, native, or scripting Application Programming Interface (including all ArcGIS, open source, and third-party APIs) that has mapping capabilities and can be used to access ArcGIS location services.Learn more. Developers create a client ID by defining an application on their developer dashboard.