public string Finalize()
{
ShippingProvider shippingProvider = purchaseProviderFactory.CreateShippingProvider(order.Sender.Country);
var invoice = purchaseProviderFactory.CreateInvoice(order);
// Send invoice
invoice.GenerateInvoice();
var summary = purchaseProviderFactory.CreateSummary(order);
summary.Send();
// Send summary
order.ShippingStatus = ShippingStatus.ReadyForShippment;
return(shippingProvider.GenerateShippingLabelFor(order));
}