Remove PDF Forms in PHP SDK

<?php
require_once 'vendor/autoload.php';

use Aspose\PDF\Api\PdfApi;

function delFormFields() {
    $LOCAL_FILE_NAME = "C:\\Samples\\sample.pdf";
    $STORAGE_FILE_NAME = "sample.pdf";
    $RESULT_FILE_NAME = "output_sample.pdf";
    $FIELD_NAME      = "Signature_1";
    
    // Load credentials from JSON file
    $credentials = json_decode(file_get_contents('credentials.json'), true);
    
    $pdfApi = new PdfApi($credentials['id'], $credentials['key']);
    
    try {
        // Load Pdf file
        $fileData = file_get_contents($LOCAL_FILE_NAME);
        $uploadResult = $pdfApi->uploadFile($STORAGE_FILE_NAME, $fileData);
        echo $uploadResult->getResponseText() . PHP_EOL;
    } catch (Exception $e) {
        echo 'Error uploading file: ' . $e->getMessage() . PHP_EOL;
    }
    
    try {
        // Delete form field from PDF
        $response = $pdfApi->deleteField($STORAGE_FILE_NAME, $FIELD_NAME);
        echo $response->getStatus() . PHP_EOL;

        // Download changed PDF file
        $downloadRes = $pdfApi->downloadFile($STORAGE_FILE_NAME);
        file_put_contents($RESULT_FILE_NAME, $downloadRes->getContents());
    } catch (Exception $error) {
        echo "Error processing PDF: " . $error->getMessage() . PHP_EOL;
    }
}

delFormFields();