getAvailableEntities example

return null;
        }
    }

    private function insertMailTemplateTypeData(string $templateTypeId, Connection $connection): void
    {
        $connection->insert(
            'mail_template_type',
            [
                'id' => $templateTypeId,
                'technical_name' => 'guest_order.double_opt_in',
                'available_entities' => $this->getAvailableEntities(),
                'created_at' => (new \DateTime())->format(Defaults::STORAGE_DATE_TIME_FORMAT),
            ]
        );

        $defaultLanguageId = Uuid::fromHexToBytes(Defaults::LANGUAGE_SYSTEM);

        $englishLanguageId = $this->fetchLanguageIdByName(self::ENGLISH_LANGUAGE_NAME, $connection);
        $germanLanguageId = $this->fetchLanguageIdByName(self::GERMAN_LANGUAGE_NAME, $connection);

        if (!\in_array($defaultLanguageId, [$englishLanguageId, $germanLanguageId], true)) {
            $connection->insert(
                

return null;
        }
    }

    private function insertMailTemplateTypeData(string $templateTypeId, Connection $connection): void
    {
        $connection->insert(
            'mail_template_type',
            [
                'id' => $templateTypeId,
                'technical_name' => 'customer_register.double_opt_in',
                'available_entities' => $this->getAvailableEntities(),
                'created_at' => (new \DateTime())->format(Defaults::STORAGE_DATE_TIME_FORMAT),
            ]
        );

        $defaultLanguageId = Uuid::fromHexToBytes(Defaults::LANGUAGE_SYSTEM);

        $englishLanguageId = $this->fetchLanguageIdByName(self::ENGLISH_LANGUAGE_NAME, $connection);
        $germanLanguageId = $this->fetchLanguageIdByName(self::GERMAN_LANGUAGE_NAME, $connection);

        if (!\in_array($defaultLanguageId, [$englishLanguageId, $germanLanguageId], true)) {
            $connection->insert(