basic-customer-sync.js

var apiInstance = new SquareConnect.CustomersApi();

db.each("SELECT * FROM Customers WHERE ...", function (err, row) {
    apiInstance.createCustomer({
        given_name:row.given_name,
        family_name:row.family_name,
        email_address:row.email_address
    }).then(function (data) {
        console.log('API called successfully. Returned data: ' + data);
    }, function (error) {
        console.error(error);
    });
});