Originally posted by
How do you know if they are already discounted more than the alloted amount?
Usually an item will reflect the promo value:
Do you see where it says 25% off on both screen shots? Your partner code is only worth 15% and discounts cannot be stacked in orders, so the higher discount applies and the lower discount (your partner code) will not be applied. You might still get the commission, I'm not sure on that part, but you won't get 40% off the order (25% +15%).