Must vending machines have the card enabled interface already on them wouldnt it be as easy as writing an interface to integrate into the payment suite that allows for this option?
Discussion
Possibly. A couple of years ago, I've seen some companies working on #Bitcoin vending machines already...
...found some working a decade ago already - on-chain obviously
https://www.coindesk.com/markets/2014/08/24/6-cool-machines-that-accept-bitcoin/