private function getContentTypeIds(array $contentTypeIdentifiers): array
    {
        $idList = [];

        foreach ($contentTypeIdentifiers as $identifier) {
            try {
                $contentType = $this->contentTypeHandler->loadByIdentifier($identifier);
                $idList[] = $contentType->id;
            } catch (APINotFoundException $e) {
                continue;
            }
        }

        return $idList;
    }