public function cancelSubscription($subscriptionId, \DateTime $cancellationDate = null, $cancellationNote = null)
    {
        $requestData = new Cancel\RequestData($subscriptionId);
        $requestData->setCancellationDate($cancellationDate);
        $requestData->setCancellationNote($cancellationNote);

        $request = new Cancel\Request($requestData);

        return $this->sendRequest($request, Cancel\ApiResponse::class);
    }