/**
  * @param RequestInterface $request
  *
  * @return RequestInterface
  */
 private function appendQueryParams(RequestInterface $request)
 {
     $queryParams = $this->auth->getQueryParameters();
     foreach ($queryParams as $key => $value) {
         $uri = Uri::withQueryValue($request->getUri(), $key, $value);
         $request = $request->withUri($uri);
     }
     return $request;
 }