I am trying to give 100% discount on some products in exchange for user's points. So if a product costs $29.99 and the user enters 28 as discount amount in checkout page..the resective discount is applied..but when a user gives 29.99 as discount amount in checkout page then no discount is applied and the user has to pay the full amount for that product i.e $29.99. So how can I implement 100% discounts on my products in exchange of userpoints?
tks in adv!
vilash