Page Comparison

<?php
$url = 'https://secure.platononline.com/post/';
$pass = '**************';

$data['client_key'] = 'DEMO009991';
$data['action'] = 'GET_RECEIPT';
$data['order_id'] = '40922-37832-38861';
$data['type'] = 'SALE';
//$data['client_order_id'] = '';

$data['hash'] = md5(
                  strtoupper(
                    $data['order_id'].
                    $data['type'].
                    $data['client_key'].
                    $pass
                  )
                );

//var_dump($data); die();

$post_data = http_build_query($data);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

$response = curl_exec($ch);

if (curl_errno($ch)) {
    $error[] = 'CURL ErrorNo: ' . curl_errno($ch);
    $error[] = 'CURL Error: ' . curl_error($ch);
    $error[] = 'Url: ' . $url;
    $error[] = 'Data: ' . var_export($data, true);

    echo print_r($error, true);
}

curl_close($ch);

print_r($response);