In August 2023, we removed the use of coupon codes. Many users would get to the checkout page and see the text, Do you have a coupon? so they would go and hunt down an affiliate's coupon code to use. Now that affiliate has just earned a referral even though they didn't actually refer that person to the site. We had one person who had gotten listed on one of those coupon sites advertising 50% off instead of $50 off. As you can imagine, he made a killing off of referral fees. We love our affiliates but it has to be a win-win situation for both of us and we are very generous with our referral amounts.
We have tried to make the affiliates aware of this change so they can modify their campaigns accordingly, however, a coupon code may still show up on some coupon sites.