# IAM configuration reference

You can view reference information about configuration of authentication .

## Links

* [SAML configuration reference](/en/enterprise-server@3.22/admin/managing-iam/iam-configuration-reference/saml-configuration-reference)

  You can see SAML metadata for , and you can learn more about available SAML attributes and response requirements.

* [Username considerations for external authentication](/en/enterprise-server@3.22/admin/managing-iam/iam-configuration-reference/username-considerations-for-external-authentication)

  When you use , GitHub follows certain rules to determine the username for each user account .