Hi I'm interested in all the possibilities of coupons, since I plan to do some marketing stuff via them. For example, I'm interested in the following: - the ability to set a date when the coupon expires - the ability to establish that the same coupon can be used by no more than X people, each of which - only once - the ability to have coupons of different types, so, one coupon - to receive one type of goods, and another coupon to receive goods of a different type.