I received three certificates and attempted to redeem them on my phone using their app. The first code was accepted, but then did not show up on my account. I attempted to use it again and it said it had been redeemed. I then logged in on my computer so I could see the full screen and redeemed the second code. It appears on my account on my PC, but does not appear on my phone app, which you need to use it at a restaurant. I am logged into my same account on both. The app is very buggy and won't let you exit some screens.