-however, a phone app directly linked to a wallet and the payment terminal adapted to take bitcoin payments with some form of shortened confirmation could work.
Confirmation time is based on the network congestion and the fees. So any apps would just be useless , imho. However, as long as all the data is correct, (btc wallet) I think any transaction could be deem as good already. And both customers and merchants will have nothing to worry. This is a healthy good is indeed if true. We're getting closer to adoption and its going to be investing to see how everything will pans out for Germany in 2019.