You can request a refund via the CM Payments back office.
- Go to Manual Actions -> Refund Request;
- Fill in the Payment Cluster ID or Merchant transaction ID (Order ID);
- If the total amount has to be refunded, click on request refund at the bottom of the screen;
- If you want to request a partial refund -> adjust the refund amount, click update and then request refund.
It is also possible to request a refund via Order API. More information can be found in our implementation manual.