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# About API Credentials

API credentials allow you to authenticate your custom code with Eon so you can use the Eon API.
Each set of API credentials must be assigned a role, which grants the permissions needed to perform tasks in Eon.

A set of API credentials contains two properties: The **client ID** and **client secret**.
Think of these like a username and password.
With these credentials, your custom code can authenticate with Eon and retrieve a temporary access token.
You'll then pass the access token in the `Authorization` header of subsequent API requests.

For more information on the Eon API, see the [Eon API overview](/api).