!!! Overview
[{$pagename}] is an [OPTIONAL] [Access Token] [hash] value. 

[{$pagename}] value is the [base64url] encoding of the left-most half of the [hash] of the octets of the [ASCII] representation of the [access_token] value, where the [hash] [algorithm] used is the [hash] [algorithm] used in the [alg] Header Parameter of the [Identity Token]'s [JOSE] Header. 

For [Example], if the [alg] is [RS256], hash the [access_token] value with [SHA-256], then take the left-most 128 bits and [base64url] [encode|encoding] them. 

[{$pagename}] value is a [case-sensitive] [string].

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