Firmar PDF en PHP SDK

    require __DIR__.'\..\..\vendor\autoload.php';

    use Aspose\PDF\Configuration;
    use Aspose\PDF\Api\PdfApi;

    $config = [
        'LOCAL_FOLDER' => "C:\\Samples\\",
        'PDF_DOCUMENT_NAME' => "sample.pdf",
        'LOCAL_RESULT_DOCUMENT_NAME' => "output_sample.pdf",
        'LOCAL_SIGNATURE_PATH' => "C:\\Samples\\Signatures\\3",
        'SIGNATURE_PFX' => "signature.pfx",
        'SIGNATURE_FORM_FIELD' => 'Signature_1',
        'SIGNATURE_PASSWORD' => 'Password',
        'SIGNATURE_CONTACT' => 'Contact',
        'SIGNATURE_LOCATION' => 'Location',
        'SIGNATURE_AUTHORITY' => 'Issuer',
        'SIGNATURE_DATE' => '04/19/2025 12:15:00.000 PM',
        'SIGNATURE_RECT' => new Aspose\PDF\Model\Rectangle(array('llx' => 100, 'lly' => 100, 'urx' => 0, 'ury' => 0))
    ];

    class PdfSignatures {
        private $pdfApi;
        private $config;

        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->config = $config;
            $this->_create_rest_api();
        }

        public function uploadFile($folder, $fileName) {
            $filePath = $folder . DIRECTORY_SEPARATOR . $fileName;
            $data = file_get_contents($filePath);
            $this->pdfApi->uploadFile($fileName, $data);
            echo "File '$fileName' successfully uploaded!\n";
        }

        public function uploadDocument() {
            $this->uploadFile($this->config['LOCAL_FOLDER'], $this->config['PDF_DOCUMENT_NAME']);
        }

        public function downloadResult() {
            $response = $this->pdfApi->downloadFile($this->config['PDF_DOCUMENT_NAME']);
            $filePath = $this->config['LOCAL_FOLDER'] . DIRECTORY_SEPARATOR . $this->config['LOCAL_RESULT_DOCUMENT_NAME'];
            file_put_contents($filePath, $response->body);
            echo "Downloaded: $filePath\n";
        }

        public function appenSignature() {
            $signature = new \Aspose\PDF\Model\Signature( array(
                'authority'=> $this->config['SIGNATURE_AUTHORITY'],
                'contact' => $this->config['SIGNATURE_CONTACT'],
                'date' => $this->config['SIGNATURE_DATE'],
                'form_field_name' => $this->config['SIGNATURE_FORM_FIELD'],
                'location' => $this->config['SIGNATURE_LOCATION'],
                'password' => $this->config['SIGNATURE_PASSWORD'],
                'rectangle' => $this->config['SIGNATURE_RECT'],
                'signature_path' => $this->config['SIGNATURE_PFX'],
                'signature_type' => \Aspose\PDF\Model\SignatureType::PKCS7,
                'visible' => TRUE )
            );

            $field = new \Aspose\PDF\Model\SignatureField( array(
                'page_index' => 1,
                'signature' => $signature,
                'partial_name' => 'sign1',
                'rect' => $this->config['SIGNATURE_RECT'])
            );

            $response = $this->pdfApi->postSignatureField(
                $this->config['PDF_DOCUMENT_NAME'],
                $field
            );

            if ($response->code === 200) {
                echo "appenSignature(): Signature '" . $this->config['SIGNATURE_CONTACT'] . "' successfully replaced.\n";
            } else {
                echo "appenSignature(): Failed to replace signature. Code: " . $response->code . "\n";
            }
        }
    }

    try {
        $signatures = new PdfSignatures($pdfApi, $configParams);
        $signatures->uploadFile($configParams['LOCAL_SIGNATURE_PATH'], $configParams['SIGNATURE_PFX']);
        $signatures->uploadDocument();
        $signatures->appenSignature();
        $signatures->downloadResult();
    } catch (Exception $e) {
        echo "Error: " . $e->getMessage() . "\n";
    }