My son hates carrying a wallet when he's out, and said he thinks he saw someone using a ring to tap and pay for something. He said it looked like a wooden ring.
Can anyone identify if this is what he saw, and if so, is the ring specific to a bank? Or a particular phone etc?
Would I need to know his ring size to get him one as a Christmas gift, or are they adjustable?
I'm going around in circles with my Google search