Expiring Promo Code
I'd like to send customers a temp promo code that expires 72 hours after they receive a particular email. Is there a way to auto-generate promo codes that have a lifespan of 72 hours starting after they open their email. I don't want to set it to 72 hours after I send the broadcast because some people won't open it until 72 hours later.
I would add that it would be great to be able to determine the time the code would expire.
Similarly I'd like to be able to ensure a contact can only use a given promo code ONE time.