public void Pay(decimal amount, string customerId, string orderId, string paymentMethod)
{
switch (paymentMethod)
{
case "check":
var checkTransaction = PaymentTransaction.With(paymentMethod, amount, orderId);
_transactionRepo.Save(checkTransaction);
break;
case "card":
_paymentProvider.AuthorisePayment(amount, orderId, paymentMethod, customerId);
var cardTransaction = PaymentTransaction.With(paymentMethod, amount, orderId);
_transactionRepo.Save(cardTransaction);
break;
case "direct-debit":
_paymentProvider.AuthorisePayment(amount, orderId, paymentMethod, customerId);
var directDebitTransaction = PaymentTransaction.With(paymentMethod, amount, orderId);
_transactionRepo.Save(directDebitTransaction);
break;
}
var orderConfirmationEmail = _emailGateway.NewEmailFor(orderId, customerId, paymentMethod);
_emailGateway.Send(orderConfirmationEmail);
}