public function ExportUnsubscribeReasonCount($from = null, $to = null, $fileFormat = \ElasticEmailEnums\ExportFileFormats::Csv, $compressionFormat = \ElasticEmailEnums\CompressionFormat::None, $fileName = null) {
        return $this->sendRequest('contact/exportunsubscribereasoncount', array(
                    'from' => $from,
                    'to' => $to,
                    'fileFormat' => $fileFormat,
                    'compressionFormat' => $compressionFormat,
                    'fileName' => $fileName
        ));
    }