When an APX Payment fails the system determines if the payment method is VOID, or a REFUND should be issued, or if the payment method needs to be REVERSED.
For example, if a REFUND or VOID is rejected by APX due to incomplete processing of the payment, the option REVERSED is given.
A payment reversal is when a transaction paid to you is returned to the buyer. This typically happens after a chargeback or having lost a dispute with a customer.
In this situation, it is common to want to reverse the actions that a transaction triggered when it was originally received.