code: def refresh_access_information(self, refresh_token):
          
          if self.config.grant_type == 'password':
              data = {'grant_type': 'password',
                      'username': self.config.user,
                      'password': self.config.pswd}
          else:
              data = {'grant_type': 'refresh_token',
                      'redirect_uri': self.redirect_uri,
                      'refresh_token': refresh_token}
          retval = self._handle_oauth_request(data)
          return {'access_token': retval['access_token'],
                  'refresh_token': refresh_token,
                  'scope': set(retval['scope'].split(' '))}
docs: Return updated access information for an OAuth2 authorization grant.
  
          :param refresh_token: the refresh token used to obtain the updated
              information
          :returns: A dictionary with the key/value pairs for access_token,
              refresh_token and scope. The refresh_token value will be done when
              the OAuth2 grant is not refreshable. The scope value will be a set
              containing the scopes the tokens are valid for.
  
          Password grants aren't refreshable, so use `get_access_information()`
          again, instead.