PollToken polls the server at pollURL until an access token is granted or denied.

RequestCode initiates the authorization flow by requesting a code from uri.

Wait polls the server at uri until authorization completes.

ErrTimeout is thrown when polling the server for the granted token has timed out.

ErrUnsupported is thrown when the server does not implement Device flow.

CodeResponse holds information about the authorization-in-progress.

WaitOptions specifies parameters to poll the server with until authentication completes.