code: function retrieveSteamAPIMethods(key, callback) {
  
      var _steam = new Steam();
      _steam.getSupportedAPIList({key:key}, function(err, data) {
  
          if (err) return callback(err);
  
          var apiList = data.apilist;
          if (apiList === undefined) return callback(new Error('No data returned'));
  
          apiList = apiList.interfaces;
  
          // List of interfaces
          for (var i= 0; i<apiList.length; i++) {
              var _interface = apiList[i];
              var methods = _interface.methods;
  
              // List of methods
              for (var j= 0; j<methods.length; j++) {
                  var method = methods[j];
                  var optionalParams = [], requiredParams = [];
                  var params = method.parameters;
  
                  //List of parameters
                  for (var k=0; k<params.length; k++) {
                      var param = params[k];
  
                      if (param.optional) {
                          optionalParams.push(param.name);
                      } else {
                          requiredParams.push(param.name);
                      }
                  }
  
                  buildSteamWrapperMethod(_interface.name, method.name, method.version, method.httpmethod, requiredParams, optionalParams);
              }
          }
          callback();
  
      });
  }
docs: Retrieve all Steam WebAPI http methods and add to our class prototype