document/google/tested on my Magento 1.8.1+1.9.2CE but I can't get it to work:
I have a product like sku123. The customer buys it and gets a coupon code for free (10€ discount for the next 6 months). But the coupon code should have a expire date: 6 months after sale date.
I found no way to do this. Modules bring x-features, but not this one: expire-date that is 6 months after the sale date.
Can anybody give me a hint how this can be done?
Thanks in advance!