First of all, this is a V3 topic and we will get it moved to that section.
Having the credit reside in the wristband means SambaPOS will need to talk back to the RFID reader which is not currently possible without further testing of RFID readers/writers. SambaPOS can receive data from RFID readers (because they act like barcode scanners - a Windows HID device), but we can only talk back via COM ports (like we do for pole displays) - This is where the work will be in testing solutions to see if its possible short term.
I would have all of the terminals linked by wifi and have the SambaPOS wristband account updated as each sale is processed. No credit stored in wristband, just used to access the account (via the wristbands unique ID) at each terminal to pay for the sale.
Reporting in V3 is better, but yes, more work does need to be done on A4 printing, as the focus in the past has been on using the receipt printers for reporting and/or sending reports by email.
Lastly - I love the concept here. I never would have thought of this scenario. This is a good use of SambaPOS's flexibility.