protected static function _delete($uri, $client = null)
  {
    if (is_null($client)) {
      $client = new Recurly_Client();
    }
    $response = $client->request(Recurly_Client::DELETE, $uri);
    $response->assertValidResponse();
    if ($response->body) {
      return Recurly_Base::__parseResponseToNewObject($response, $uri, $client);
    }
    return null;
  }