public decimal CheckoutCart(CartDTO cartViewModelObj)
{
decimal totalBillAmount = 0;
if (cartViewModelObj != null && cartViewModelObj.CartItems != null && cartViewModelObj.CartItems.Count > 0)
{
var promotionCodes = promotionObj.GetActivePromotionCode();
totalBillAmount = promotionObj.ApplyPromotionCode(cartViewModelObj.CartItems, promotionCodes);
}
return(totalBillAmount);
}