If you wondered how a client would have to look like to work with the authentication framework, it is pretty straightfoward:

1. Request a token
2. Put that token on the authorization header (along with a registered scheme) and make the service call

e.g.:

var oauth2 = new OAuth2Client(_oauth2Address);
var swt = oauth2.RequestAccessToken(
  "username", "password", _baseAddress.AbsoluteUri);

var client = new HttpClient { BaseAddress = _baseAddress };
client.DefaultRequestHeaders.Authorization = 
  new AuthenticationHeaderValue("Bearer", swt);
 
var response = client.Get("identity");
response.EnsureSuccessStatusCode();

HTH