public PoSCreditOrder(Cart cart, PaymentDetails paymentDetails)
     : base(cart)
 {
     this.paymentDetails = paymentDetails;
     this.paymentProcessor = new PaymentProcessor();
 }
 protected Order(Cart cart)
 {
     this.cart = cart;
 }
 public PoSCashOrder(Cart cart)
     : base(cart)
 {
 }
 public void NotifyCustomerOrderCreated(Cart cart)
 {
     throw new NotImplementedException();
 }