setAccessKey example

$entity = new ProductExportEntity();

        $entity->setId('');
        $entity->setHeaderTemplate($dataBag->get('headerTemplate') ?? '');
        $entity->setBodyTemplate($dataBag->get('bodyTemplate') ?? '');
        $entity->setFooterTemplate($dataBag->get('footerTemplate') ?? '');
        $entity->setProductStreamId($dataBag->get('productStreamId'));
        $entity->setIncludeVariants($dataBag->get('includeVariants'));
        $entity->setEncoding($dataBag->get('encoding'));
        $entity->setFileFormat($dataBag->get('fileFormat'));
        $entity->setFileName($dataBag->get('fileName'));
        $entity->setAccessKey($dataBag->get('accessKey'));
        $entity->setSalesChannelId($dataBag->get('salesChannelId'));
        $entity->setSalesChannelDomainId($dataBag->get('salesChannelDomainId'));
        $entity->setCurrencyId($dataBag->get('currencyId'));

        return $entity;
    }

    private function generateExportPreview(RequestDataBag $dataBag, Context $context): ?ProductExportResult
    {
        $salesChannelDomain = $this->getSalesChannelDomain($dataBag->get('salesChannelDomainId'), $context);
        $salesChannel = $this->getSalesChannel($dataBag->get('salesChannelId'), $context);