similar situation, not an account, when I worked for the bank I was involved in trials for a new device,, you either got a wristband or a sticker for your wallet/phone, you loaded these up first from your account, they worked contactless, a great idea in concept, it meant that people could just tap the bracelet when using the tube in London etc, however I loaded mine up, used to the last 50p and then tried to put this back in my account.... "no way Jose" there was no way of putting any amount of balance back in your account...... I didn't put in a very favorable review when the trial ended