private function appendOAuthPartsTo(array $queryParameters = null){
      if($queryParameters == null){
          $queryParameters = array();
      }
      $queryParameters['oauth_consumer_key'] = $this->consumerKey;
      $queryParameters['oauth_token'] = $this->oauthToken;
      $queryParameters['oauth_signature_method'] ='HMAC-SHA1';
      $queryParameters['oauth_timestamp'] = $this->oauthTimeStamp;
      $queryParameters['oauth_nonce'] =$this->oauthNonce;
      $queryParameters['oauth_version'] = '1.0';
      return $queryParameters;
  }