I'm trying to get the Merchello order process and am a bit stuck. I'm trying to create a function which is supposed to add, pay and fullfill an order in one step. I hope someone can help me fill in the blanks

            // get product : do I really need to fetch all to get the product by sku?

            var product = _merchelloContext.Services.ProductService.GetAll().FirstOrDefault(p => p.Sku == productSku);

            // get customer

            var customer = _merchelloContext.Services.CustomerService.GetByLoginName(userName);

            // create customer with fake data if it does not exist already

            if (customer == null)

            {

                customer = _merchelloContext.Services.CustomerService.CreateCustomerWithKey(userName);

                customer.Email = "[email protected]";

                customer.FirstName = "First";

                customer.LastName = "Last name";

                var destination = new Address()

                {

                    Name = "Mindfly Web Design Studio",

                    Address1 = "115 W. Magnolia St.",

                    Address2 = "Suite 504",

                    Locality = "Bellingham",

                    Region = "WA",

                    PostalCode = "98225",

                    CountryCode = "SE"

                };

                customer.CreateCustomerAddress(destination, "defaultShipping", AddressType.Shipping);

                customer.CreateCustomerAddress(destination, "defaultBilling", AddressType.Billing);

                _merchelloContext.Services.CustomerService.Save(customer);

            }

 

            var invoiceService = MerchelloContext.Current.Services.InvoiceService;

            // how do I instantiate a new invoice for my newly created customer?

            var invoice = invoiceService.CreateInvoice(Merchello.Core.Constants.DefaultKeys.InvoiceStatus.Unpaid);