When the parents pay with swiping machine,  the payment must be going DIRECT TO THE D6 SYSTEM, so that the Finance officer can do only the cash-up - comparing the receipts from the swiping machine with the printout of D6 showing the swipe transactions of the day.

This should be done at the end of the business day or every morning before the parents swipe for the next day.

That will make work easier for the lady at the swipe machine, going more paperless.