code: function (options) {
  
      this._oauth = new OAuth.OAuth(
          endpoints.requestToken,
          endpoints.accessToken,
          options.consumerKey,
          options.consumerSecret,
          '1.0',
          options.callbackUrl,
          'HMAC-SHA1'
      );
  
      // Store authenticated access if it exists
      if (options.accessToken) {
          this.accessToken = options.accessToken;
          this.accessTokenSecret = options.accessTokenSecret;
      }
  
      // Store a user ID if it exists
      if (options.userID) {
          this.userID = options.userID;
      }
  
  }
docs: OAuth API Client