I think it's useful. Now, most use promotional codes and discounts in every store, no matter which, food or clothing. So it's an effective way to save some money. Store owners can track their efforts by attaching a particular promo code to a specific marketing campaign or advertisement. Different codes can trigger the same discount, so you don't have to create an additional value for every promotion. You need a new promo code. I use this site china post ems when I need coupons or other things like that. The study showed that people who received promotional codes had heightened oxytocin levels, which is a hormone that creates feelings of happiness. So, be happy!