code: function buildSteamWrapperMethod(interfaceName, funcName, defaultVersion, httpMethod, requiredParams, optionalParams) {
  
      // Always include the key and language fields, if available
      // GetSupportedAPIList doesn't always list them.
      optionalParams.push('key');
      optionalParams.push('language');
  
      // Require gameid for methods with the same name in the different interfaces
      if (isMultiGameInterface(interfaceName)) {
          requiredParams.push('gameid');
      }
  
      var wrapperMethod = function(steamObj, callback) {
          var params = getParams(this, steamObj, requiredParams, optionalParams);
          var version = steamObj.version || defaultVersion;
          this.request(interfaceName, funcName, version, httpMethod, params, callback);
      };
  
      addInterfaceMethod(interfaceName, funcName, wrapperMethod);
  }
docs: Builds the method and add references