You can process Yordex card refunds like a normal debit card.
The refund will appear in your accountancy system as a credit note.
In Yordex the payment will appear as a separate order with a negative balance to indicate that your account was credited.
For reversals, in which the funds were not captured by the merchant and were returned (e.g. £1 charge to register an account or book a table) the order will be closed and not pushed to your accountancy system. Unless you have approved the order in which case the order will also be booked as a credit note.