Coupon code that requires owning another script
It would be useful to allow for a coupon code to require owning a certain script in order for that code to be valid for the users at checkout. For example, when I released AWarn3 I gave a code that would give 25% the purchase of AWarn3 with the intent that owners of AWarn2 would use it. There was nothing stopping other people from using that coupon code if they knew it. This would also be useful for us to give periodic deals and discounts on other scripts we have written to owners of our existing scripts.