Cancel a pending settlement operation
Cancels an operation in CREATED or QUEUED via a USER_CANCELLATION transition, emitting operation.cancelled. A non-cancelable state returns 409 INVALID_STATE_TRANSITION with currentState and allowedStates. For a regulatory chargeback (contestação regulada que vira débito) use POST /v1/operations with operationType=CANCELLATION + reasonCategory instead.
DELETE
Cancel a pending settlement operation

