Extraer enlaces de PDF en 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() {
        $pdfFilePath = $this->configParams['LOCAL_FOLDER'] . $this->configParams['PDF_DOCUMENT_NAME'];
        $pdfFileData = file_get_contents($pdfFilePath);
        $this->pdfApi->uploadFile($this->configParams['PDF_DOCUMENT_NAME'], $pdfFileData);
    }
       
    public function getAllPageLinks () {
        $result_links = $this->pdfApi->getPageLinkAnnotations($this->configParams['PDF_DOCUMENT_NAME'], $this->configParams['PAGE_NUMBER']);

        if ($result_links->getCode() == 200) {
            echo "Links array:";
            var_dump($result_links->getLinks());
        }
        else
           echo "Unexpected error : can't get links!!!";
    }

    function main() {
        global $configParams;

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