Hi Rene,
I can explain the parameters, but from my knowledge there is currently nothing behind this “integration” (until next patch as far as I know).
Client ID is the API client ID you configure in ClearPass to connect to its API, and Grant Type correspond to the type you choose there. Example:
Then, depending on the type, you should have to enter either a shared key or username / password (of course you need first to define a profile in ClearPass (for right management) and a user to associate to this profile).
Fabien