Удаление закладок из PDF в PHP SDK

    private function _create_rest_api() {
        $credentials = json_decode(file_get_contents("./Credentials/credentials.json"), true);

        $configAuth = new Configuration();
        $configAuth->setAppKey($credentials['key']);
        $configAuth->setAppSid($credentials['id']);

        $this->pdfApi = new PdfApi(null, $configAuth);
     }

    public function __construct($config) {
        $this->configParams = $config;
        $this->_create_rest_api();
    }

    public function uploadDocument() {
        $filePath = $this->configParams['LOCAL_FOLDER'] . $this->configParams['PDF_DOCUMENT_NAME'];
        $fileData = file_get_contents($filePath);

        $response = $this->pdfApi->uploadFile($this->configParams['PDF_DOCUMENT_NAME'], $fileData);
        if ($response->getCode() === 200) {
            echo "Uploaded file: {$this->configParams['PDF_DOCUMENT_NAME']}\n";
        } else {
            echo "Failed to upload file.";
        }
    }

    public function download_result() {
        $response = $this->pdfApi->downloadFile($this->configParams['PDF_DOCUMENT_NAME']);
        $filePath = $this->configParams['LOCAL_FOLDER'] . $this->configParams['LOCAL_RESULT_DOCUMENT_NAME'];

        if ($response->getCode() === 200) {
            file_put_contents($filePath, $response->getContents());
            echo "Downloaded: $filePath\n";
        } else {
            echo "Failed to download file.";
        }
    }

    public function deleteBookmark() {
        $response = $this->pdfApi->deleteBookmark($this->configParams['PDF_DOCUMENT_NAME'], $this->configParams['BOOKMARK_PATH']);

        if ($response->getCode() === 200) {
            echo "Bookmark '{$this->configParams['DROP_BOOKMARK_PATH']} successfully deleted!";
        }
    }

function main() {
    global $configParams;

    try {
        $pdfBookmarks = new PdfBookmarks($configParams);
        $pdfBookmarks->uploadDocument();
        $pdfBookmarks->deleteBookmark();
        $pdfBookmarks->downloadResult();
    } catch (\Exception $e) {
        echo "Error: " . $e->getMessage() . "\n";
    }
}