Hi,
Kentico stores the skus in different tables.
Check the following SQL tables to find the info:
select * from COM_MultiBuyCouponCode -- will give you the MultiBuyDiscountID from the CouponCode itself
select * from COM_MultiBuyDiscount where MultiBuyDiscountID = [X] -- all info on the Discount
select * from COM_MultiBuyDiscountSKU where MultiBuyDiscountID = [X] -- all sku's related to your discount
The following code should get you started:
int myDiscountID = MultiBuyCouponCodeInfoProvider.GetMultiBuyCouponCodeInfo(yourCouponGuid)
.MultiBuyCouponCodeMultiBuyDiscountID;
var skus = MultiBuyDiscountSKUInfoProvider.GetMultiBuyDiscountSKUs()
.WhereEquals("MultiBuyDiscountID", myDiscountID);