If you refunded a transaction by mistake, you can cancel the refund as long as its status is not “Captured”.
After that, it's too late. A refund cannot be refunded.
How to recover the funds?
Two solutions:
- Send a payment order to the buyer.
- Duplicate the original transaction.
As long as duplication is permitted by the banks, you can duplicate the original transaction from the Merchant Back Office.
The transaction will not benefit from liability transfer.
This operation should remain an exceptional case.