Generating OAM Resource specific access tokens using OAM Master Token

Hello,

I am trying to generate OAM Access tokens using OAuth API's.

I am able to retrieve OAM Master token and post decode url, I am able to set it as OAM_ID cookie on the browser.

I am not able to determine how to retrieve OAM Access Token, using Master Token and application-context.

All references, online and Oracle blogs, refer to -

"Obtain an OAM Access token using the OAM Credential Grant type and the OAM Master Token obtained earlier and by passing in the application context

The oracle_oam_application context is obtained from a ‘HTTP/1.1 401 Authorization required’ response obtained by simply making a GET request to the webgate protected resource. It is the value of the request-ctx variable in the 401 response. "