Is there any way to create a coupon that will only work if the customer has purchased a particular item?
We are a theater company that is about to offer subscription packages. On top of the subscription package, we are discussing having subscribers be able to buy discounted tickets for people accompanying them. If we just make a secret coupon code, there's nothing to stop them from giving that coupon out to all their friends, whether they are accompanying the subscriber or not. What we'd like to do is make a coupon code that will only work for customers who have previously purchased the subscription package item. It doesn't seem possible with Zen Cart as it is; is there any module that can accomplish this?
(I'm using Zen Cart 1.3.7)