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/co[....]-atualizacoes-da-portaria-195-2020/
https://help.pt.zappysoftware.com/p[....]es/tudo-sobre-o-qr-code-nas-faturas
https://dre.pt/application/conteudo/140210523

Download:
https://www.uploadbank.com/ympj08ax94qq