code: def cancel(self, order_ref):
          
          response = self.client.post(self._cancel_endpoint, json={"orderRef": order_ref})
  
          if response.status_code == 200:
              return response.json() == {}
          else:
              raise get_json_error_class(response)
docs: Cancels an ongoing sign or auth order.
  
          This is typically used if the user cancels the order
          in your service or app.
  
          :param order_ref: The UUID string specifying which order to cancel.
          :type order_ref: str
          :return: Boolean regarding success of cancellation.
          :rtype: bool
          :raises BankIDError: raises a subclass of this error
                               when error has been returned from server.