These codes inform you that the client asked for a refund. They come with a refund message. Funds will be automatically debited from your bank account on the same day as the message is received.

Proof code Description More detailsRequired action
MD06 Authorized operation contested Your client asked for the refund of an authorized operation (Core system only). The order can be received until eight weeks after the direct debit. Contact your client.
MD01 No valid mandate or unauthorized operation When receiving a message of failed refund, the client asked for a funds return declaring it was an unauthorized operation. May be received until 13 months after the payment. Contact your client for more details.