code: @Override
      public void signRequest(Token accessToken, OAuthRequest request) {
          request.addHeader("Authorization", "Bearer " + accessToken.getToken());
      }
docs: Adds an authorization header containing the bearer token to a request.
  It is intended for use in API calls after getting the access token, such
  as requesting the user's profile.
  
  @param accessToken the user's access token.
  @param request the requests.