Cancels an existing transaction that has not yet been processed. A cancellation should be issued as soon as you know the transaction will not be completed.
A Deferred or Instant payment transaction can only be canceled before the payment processing cut-off time. If the Cancel request returns an error, a Refund call should be executed instead.
Additionally, this endpoint can be used to cancel a Bank Authorization when a user revokes access to their bank from your application. If the bank authorization transaction is voided, further /capture or /deposit requests using the canceled transaction will not be permitted. Any outstanding transactions with a pending status related to the bank authorization will remain unchanged and must be canceled individually if necessary.