So there has to be a form of supervision for there to be some kind of control. There has to be a system that sends out a notification when a reference number is issued. The system expects to receive a transaction confirmation. Every time a reference number is issued, and since the number is only valid for a certain period of time, if the person does not conduct the transaction that same day, a signal will therefore have to be sent.
On June 7th, 2018. See this statement in context.