1. Go to this page and download the library: Download petervdbroek/ideal2 library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
petervdbroek / ideal2 example snippets
$ideal = new iDEAL('<merchantId>', '<client>', '<baseUri>', '<certificatePath>', '<privateKeyPath>', '<publicCertificateFilePath>');