Mine had a stupid thumb-scanning system for all thinks food-related, including vending machines.
I never got put onto the system, since I joined that school part-way through a school year, and I couldn't be bothered to do so since I always had a packed lunch.
But if I wanted say, a piece of fruit, or a bottle of juice, I couldn't buy it.
Even though I had cash in my pocket.
They would not accept cash at the vending machine, or the snack shop, or the cafeteria.
I had to get my thumb scanned onto the system, then put money into a different machine that would add it to my account, and then scan my thumb to buy stuff.
It was fine to embrace technology, but to make it so that I can't just buy something with a coin was stupid.