private async Task ValidateGiftCardAmountsAsync()
{
// grab every gift card that the customer applied to this order
IList <GiftCard> appliedGiftCards = await _giftCardService.GetActiveGiftCardsAppliedByCustomerAsync(await _workContext.GetCurrentCustomerAsync());
if (appliedGiftCards.Count > 1)
{
throw new Exception("Only one gift card may be applied to an order");
}
foreach (GiftCard nopGiftCard in appliedGiftCards)
{
// check isam to make sure each gift card has the right $$
GiftCard isamGiftCard = _isamGiftCardService.GetGiftCardInfo(nopGiftCard.GiftCardCouponCode).GiftCard;
decimal nopAmtLeft = nopGiftCard.Amount;
List <GiftCardUsageHistory> nopGcHistory = (await _giftCardService.GetGiftCardUsageHistoryAsync(nopGiftCard)).ToList();
foreach (var history in nopGcHistory)
{
nopAmtLeft -= history.UsedValue;
}
if (isamGiftCard.Amount != nopAmtLeft)
{
throw new Exception("A gift card has been used since it was placed on this order");
}
}
}