We have a customer that would like to send a voucher to newsletter subscribers when they sign up.
They want that voucher to expire after 30 days.
As far as I can tell, there is no way to set an expire date for a voucher - you can only set an end-date for a discount, which isn't really useful in this scenario.
It would make sense to have a "valid period" for voucher-lists (x days or y weeks, or something), and an expire date for the individual vouchers.