post
https://testapi.multisafepay.com/v1/json/orders//cancel
Cancels Bancontact QR payments, whether the QR code has been scanned or not. This ensures funds aren't captured. The status will change to cancelled.
Note:This endpoint can only be used for Bancontact QR payments.
Completed transactions cannot be cancelled. Requests to cancel a completed transaction return an HTTP
200response with the transactionstatusset tocompleted.