Note: The app is not finish.
1 - You read the qr code with a qr reader
2 - Copy the code
3 - Paste in the app
4 - The app decode the code to human readable format.
References:
https://blogs.sap.com/2020/11/17/codigo … -195-2020/
https://help.pt.zappysoftware.com/porta … as-faturas
https://dre.pt/application/conteudo/140210523