Coupons never worked – McDonald's Review

I tried to use coupons since I downloaded this app. It never worked. I don't know if it's scanner's problem or coupons problem. But it doesn't work anyway. If you are extremely lucky, staff input the coupon manually and you can get discount. But 99% of time staff shows you bitter face and they just say you can't use it. If the coupons don't work, there is no use of this app.
Review by Dark-Bebe on McDonald's.