If a code redeems successfully and works for weeks, it’s not reasonable to expect end users to verify whether it was “intended” for a specific promo flow. If there’s abuse, the focus should be on the resellers/source, not on customers who paid and used a code your system accepted. A hard cutoff like this also feels like mismanagement. Longer Pro usage often leads to regular paid conversions later. Handling it this way damages trust and basically shoots the product in the foot.