Configure/Enable OTDS to create and include OAuth access_token in header

Hi,

I have been looking at:

https://developer.opentext.com/webaccess/#url=/awd/blogs/13336846/oauth+20+authentication+with+otds+105+patch+6&tab=501

To look into securing an external web service to Content Server users only. I have managed to get the OAuth server up and running and use Postman to pass the login credentials to demonstrate an access_token be created.
What i am after achieving is to create this when the normal user logins in with the standard login in screen.

Is this possible?

I have been trying to create an authentication handler to use OAuth stuff setup in the link provided but with no success.

Any help or tips would be greatly appreciated.

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