@Brokar @eunews
I would settle for one of those Taiwanese railway RFID prepaid charge-card widgets. KISS!
The Fancy Payment Cards Of Taiwan
If you’re an old-schooler, you might still go to the local bar and pay for a beer with cash. You could even try and pay with a cheque, though the pen-and-paper method has mostly fallen out of…
Hackaday (hackaday.com)