!!! Overview
The [{$pagename}] is sent the by [Authorization Server] to the [OAuth Client] in response to the successful [Authorization Request].

The [Resource Owner] has to approve the [{$pagename}] before the [Authorization Server] can successfully respond to the [OAuth Client].

In [OAuth 2.0] the [{$pagename}] is an credential representing the [Resource Owner]'s [Delegation] to the [OAuth Client] permitting access to the [Resource Owner]'s protected resources on the [Resource Server]. 

[{$pagename}] then used by the [OAuth Client] to obtain [OAuth Token Request] from the [Authorization Server].[1]  

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
----
* [#1] - [RFC 6749#section-1.3|https://tools.ietf.org/html/rfc6749#section-1.3|target='_blank'] - based on data observed:2015-05-18