public void ModifyPaymentStatus(string paymentID, POSPayment.Status status)
{
foreach (Object paymentObject in Payments)
{
if (paymentObject is POSPayment && ((POSPayment)paymentObject).PaymentID == paymentID)
{
((POSPayment)paymentObject).PaymentStatus = status;
onOrderChange(this, OrderChangeTarget.PAYMENT);
}
}
}