Got a Reliance Digital Movie Coupon... How Do I Use This Thing?

Hey guys, we bought something from Reliance Digital and got this Discount Coupon for movie tickets. It’s got a coupon ID but we have no clue how to use it. Tried scanning it, but nothing happened. Do we just show it at the theater or need to redeem it somewhere? Anyone figured this out before? Help a bro out!!!!!?