Why: client can't see the price before paying when device is on waiters hand upside from customer point of view
How 1: Setting On/Off to enable rotation of the screen after "Ok" pressed. Screen return to normal when NFC read or incoming Onchain detected. And then waiter can print receipt.
How 2: Could also be possible by integration of "Rotation Controll App" function, which turns screen 180' when merchant/waiter tilts device towards customer. (I installed App onto Bitcoinize, and it works nice.)
Will make video to show what I mean one day...