public ActionResult DiscountRequestPost(string coupon)
{
DiscountCode discount = db.DiscountCodes.FirstOrDefault(current => current.Code == coupon);
string result = CheckCouponValidation(discount);
if (result != "true")
{
return(Json(result, JsonRequestBehavior.AllowGet));
}
List <ProductInCart> productInCarts = GetProductInBasketByCoockie();
decimal subTotal = GetSubtotal(productInCarts);
decimal total = subTotal;
DiscountHelper helper = new DiscountHelper();
decimal discountAmount = helper.CalculateDiscountAmount(discount, total);
SetDiscountCookie(discountAmount.ToString(), coupon);
return(Json("true", JsonRequestBehavior.AllowGet));
}