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OpenID Connect Token Introspection
As part of the authorization process, token introspection allows all OAuth connected apps to check the current state of an OAuth 2.0 access or refresh token. The resource server or connected apps send the client app’s client ID and secret to the authorization server, initiating an OAuth authorization flow. As part of this flow, the authorization server validates, or introspects, the client app’s access token. If the access token is current and valid, the client app is granted access.

