Add Image to Header of PDF in 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 uploadFile($fileName) {
        $filePath = $this->configParams['LOCAL_FOLDER'] . $fileName;
        $fileData = file_get_contents($filePath);

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

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

    public function downloadResult() {
        $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 addImageHeader () {
        $imageHeader = new ImageHeader(array(
            'background' => true,
            'horizontal_alignment' => \Aspose\PDF\Model\HorizontalAlignment::CENTER,
            'file_name' => $this->configParams['IMAGE_HEADER_FILE'],
            'width' => 24,
            'height' => 24,
        ));
        $resultHeader = $this->pdfApi->postDocumentImageHeader($this->configParams['PDF_DOCUMENT_NAME'], $imageHeader);

        if ($resultHeader->getCode() === 200) {
            echo 'Successfully appended image header ' . $this->configParams['IMAGE_HEADER_FILE'];
        }
        else
            throw new Error("Unexpected error : can't append image header!");
    }

    function main() {
        global $configParams;

        try {
            $pdfHeaderHeader = new PdfHeaderFooter($configParams);
            $pdfHeaderHeader->uploadDocument();
            $pdfHeaderHeader->uploadFile($configParams['IMAGE_HEADER_FILE']);
            $pdfHeaderHeader->addImageHeader();
            $pdfHeaderHeader->downloadResult();
        } catch (\Exception $e) {
            echo "Error: " . $e->getMessage() . "\n";
        }
    }