public void BuyItems(decimal payAmount, Sale sale)
 {
     // Does nothing
 }
 public void VoidSale(Sale sale)
 {
     // Does nothing
 }
 public void MakePayment(decimal paymentAmount, Sale sale)
 {
     // Does nothing
 }
 public void TotalSale(Sale sale)
 {
     // Does nothing
 }
 public void BuyItems(Sale sale)
 {
     // Does nothing
 }