[bornfreddy]

Iiuc, you have to "transfer" the funds from your bank account to the card device (wallet, in a way) from where you can then spend these funds without interaction with the bank? That would work.

Otherwise, without the initial withdrawal from your bank account, you could spend the money twice.

[lxgr]

Yes, only the issuer of the stored-value system can “create” funds, and they need to ensure that they do get paid for it without double spending.

That can be done using cash at a machine, with an online-authorized card transaction etc.