Discount Coupon

I ended up writing a custom DiscountCouponInfoProvider and overrode the following methods:

• ValidateDiscountCouponInternal
• CalculateUnitDiscountInternal

Here is my code if someone has any thoughts on it or if anyone needs it:

protected override bool ValidateDiscountCouponInternal(ShoppingCartItemInfo item, DiscountCouponInfo discount)
{
    // Do not apply discount coupon to product option (unless percentage) or if it is zero discount or if it is not valid
    if ((item == null) || ((item.IsProductOption && discount.DiscountCouponIsFlatValue)) ||
        (discount == null) || (discount.DiscountCouponValue <= 0) ||
        (item.ShoppingCart == null) || !discount.IsValid)
    {
        return false;
    }
    else
    {
        // Do not apply discount coupon if SKU is not assigned
        bool canBeApplied = SKUDiscountCouponInfoProvider.IsSKUAssignedToDiscountCoupon(item.SKU, discount);
        if (!canBeApplied)
        {
            return false;
        }
    }
    return true;
}



protected override double CalculateUnitDiscountInternal(ShoppingCartItemInfo item, DiscountCouponInfo discount)
{
    // Do not calculate if discount is not valid
    if (!ValidateDiscountCouponInternal(item, discount))
    {
        return 0;
    }

    // Get price after previous discounts
    double newPrice = item.UnitPriceAfterDiscountInMainCurrency;

    double discountValue = discount.DiscountCouponValue;

    // Get correct value for global discount
    if (discount.DiscountCouponIsFlatValue && discount.IsGlobal)
    {
        discountValue = item.ApplyExchangeRateFromGlobalMainCurrency(discount.DiscountCouponValue);
    }

    // Get unit discount
    discountValue = ECommerceHelper.GetDiscountValue(newPrice, discountValue, discount.DiscountCouponIsFlatValue);

    if (discount.DiscountCouponIsFlatValue)
    {
        if (!item.IsProductOption)
        {
            foreach (ShoppingCartItemInfo o in item.ProductOptions)
            {
                newPrice += o.UnitPriceAfterDiscountInMainCurrency;
            }
        }
    }

    // Discount cannot be greater than price
    return (Math.Abs(discountValue) > Math.Abs(newPrice)) ? newPrice : discountValue;
}

Hello,

We have been discussing this issue via email, so I am posting the response here as well, should anyone else need to setup the same scenario.

Discount Coupons (called Product coupons in Kentico 8) are indeed applied only to regular SKUs, but not to Product options. We do not consider changing this behaviour in near future so your customization is the best way to achieve this scenario. I went through your code and did not find any issues with it.

On a side note, if you do not need to base your discounts on Coupons, you may want to consider upgrading to Kentico 8, where we introduced a new type of discounts called Catalog discounts. While these do not feature coupon based setting, they do apply to Product options.