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How do you validate a SudTirolMobil app ticket on a bus?

If you use the SudTirolMobil app to plan a journey, it gives the option of buying a ticket/s. But it says the ticket must be validated when boarding a bus. I'm in S Tirol now and been on a bus (had a free bus pass from the hotel) and validating involves inserting a physical ticket into a machine, I see nothing that is capable of scanning a QR code from an app.
So how can you validate an eTicket purched from the app?