code: function getUsernameFromId (id) {
    var httpOpt = {
      url: '//api.roblox.com/users/' + id,
      options: {
        resolveWithFullResponse: true,
        method: 'GET'
      }
    };
    return http(httpOpt)
    .then(function (res) {
      if (res.statusCode === 200) {
        var json = JSON.parse(res.body);
        return json.Username;
      } else {
        throw new Error('User does not exist');
      }
    });
  }
docs: Define