ListLocations.js

var SquareConnect = require('square-connect');
var defaultClient = SquareConnect.ApiClient.instance;

// Configure OAuth2 access token for authorization: oauth2
var oauth2 = defaultClient.authentications['oauth2'];
oauth2.accessToken = "sq0atp-xxxxxxxx";

var api = new SquareConnect.LocationsApi();

api.listLocations().then(function(data) {
  console.log('API called successfully. Returned data: ');
  console.log(data);
}, function(error) {
  console.error(error);
});