I wanna ask generally about this system la. Since it is online reliant.

Like TnG card, credit/ debit process is done immediately from the card itself. The machine immediately knows the value and all.

With RFID, you are reliant on the sticker.

So what data does the sticker hold? If it is just a proxy to your account, that means the transaction is done with data transfer heavily reliant on communication directly from TnG server.

So what if the connection broke down?

Worse case for everyone is power failure. Which happened at Awan besar last year due to floods.