post https://sandbox.trustly.one/api/v1/transactions//cancel
This service enables a merchant to cancel a previous transaction that has not been processed yet. The merchant is encouraged to issue the cancellation as soon as it is known that the transaction will not be performed.
When an Deferred or Instant transaction is canceled the payment authorization is voided and further capture requests are not allowed. Outstanding pending transactions related to the original authorization remain unchanged and need to be canceled individually if necessary.
A Deferred or Instant transaction can be canceled only before the payment processing cut-off time (4 PM Central on business days). If the Cancel request returns an error, you should execute a Refund call.