Just wasted another 10 minutes at McDonalds.. I tried to get some food & used the buy one get one for $1.. But when I went to check out, its telling me this code is invalid.. So I tried using a different code, but its now telling me that I have to wait 15 minutes.. I am beginning to think this app is a waste of time.. Also, the code for Double Points on breakfast order never works at any McDonald's I go to..