!!! Overview
[{$pagename}] REQUIRED - a security [token] defined in [OAuth 2.0 Token Exchange] that represents the identity of the party on behalf of whom the request is being made. 

Typically the [subject] of this token will be the subject of the security [token] issued in response to this request.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]