I have to integrate an external (and existing) Authentication provider that will support the OAuth flow. 

While I understand the implementation aspects of the plugin (looking at the code was useful) I am wondering how can I extend the client life-cycle in order to create a client on the external provider (via a REST end-point) and receive a client id and secret.  Additionally I would like to extend the client model in order to make this information in the ClientApp property page.