code: private function handleTokenResponse($response)
      {
          $params = ($response instanceof OAuthToken) ? $response->getParams() : $response;
          $status = ArrayHelper::getValue($params, 'status');
          if (!is_null($status) && $status == 'success') {
              $token = ArrayHelper::getValue($params, 'data');
              if (is_null($token)) {
                  throw new Oauth2ClientException(self::CODE_NOT_SET);
              }
              return $token;
          } else {
              $message = ArrayHelper::getValue($params, 'message', self::DEFAULT_ERROR);
              throw new Oauth2ClientException($message);
          }
      }
docs: Handles token request response
  @author Adegoke Obasa <goke@cottacush.com>
  @param OAuthToken $response
  @return mixed
  @throws Oauth2ClientException