I wonder what kind of chip is being used. This would interest me as an implant if more vendors adopt a payment system where you basically reload a gift card balance onto an NFC chip. It would be like carrying cash but Uber secure unless someone rendered me unconscious or chopped off my hand.
Japan uses a very closed protocol so I am not sure the name.
What I do know is that it essentially uses the same generic write/read methods that your standard NTag213 uses.
I would like to know as well because this would be amazing in the states.