code: public function validateRequestTokenResponse($params)
      {
          if (!isset($params['oauth_token']) ||
               !isset($params['oauth_token_secret']) ||
              empty($params['oauth_token']) ||
              empty($params['oauth_token_secret'])) {
              throw new InvalidOAuthTokenException('request token');
          }
  
          return true;
      }
docs: Validates the received data for a request token.
  
  @param array $params