1. Go to this page and download the library: Download cserepesmark/acounto-api 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/ */
$response = $client->exists()->checkIfExists('example-id-123');
if ($response->json('exists')) {
echo "The resource exists!";
} else {
echo "The resource does not exist.";
}