As of, Oct 8th, we'll change the way our extra payment and refund system works.
No more "receiver confirmation" is needed, i.e. when a refund or extra payment is sent, the amount is immediately credited to the receiver's Cardmarket account.
With this comes a small adjustment on how refunds impact your "loss ratio" as a seller. If a shipment has been reported as "lost" by the buyer, you will need to refund at least 100% of that shipment's value for it to be discounted from your loss count.
These changes will make refunds easier and faster, while ensuring that the loss rate calculation is still fair.