what are you talking about, do you even go out and buy stuff???
Food stalls all over Bangkok use the Scan option and it’s super efficient and convenient…all you do is scan the code that’s printed out, multiple people do this at the same exact time countless times a minute…you put in the price then show the scan some vendors take a pic and others wait for the chime on their phone
It now takes less time to scan and pay then wait for change