What is SSL Converter?

cURL / PHP
                                    
$api = 'https://ae8.com.br/sslconverter/';
$post = [
    'certTypeFrom' => 'pfx',
    'certTypeTo' => 'crt',
    'certFile' => curl_file_create('certificate.pfx'),
    'certPassword' => 'password'
];
                                        
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $api . '?key=' . SSL_CONVERTER_KEY);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
                                        
file_put_contents('certificate.crt', $response);
curl_close($ch);