Single Sign-On (SSO) Login into Drupal using Custom OAuth 2.0 / OpenID connect Provider

Configure Drupal as an OAuth Client

Integrating Drupal with Identity Provider

• Configure the callback/redirect URL in your IdP and complete the further steps.
• Add the below details on the Drupal site (You will get these all from the OAuth provider).

Client ID	Unique identifier for the OAuth 2 client application.
Client Secret	Confidential information used to authenticate the client.
Scope	The extent of access that the client is requesting from the user and authorization server.
Authorize Endpoint:	URL where the user is authenticated and grants permissions to the client.
Access Token Endpoint:	URL where the client exchanges authorization code for an access token.
Get User Info Endpoint:	Optional URL for retrieving user information

• The 'Send Client ID and Secret in Header or Body' checkbox allows you to specify whether the Client ID and Secret should be included in the header or the body of the Token Endpoint Request. If you're unsure which option to select, you can stick with the default settings.
• Click on the checkbox to Enable Login with OAuth, scroll down, and click the Save Configuration button.

Test Connection between Drupal and OAuth Provider