Checkout PHP refund example

refund_example.php

<?php

$xml = "<?xml version='1.0'?>
<checkout>
  <identification>
    <merchant>375917</merchant>
    <stamp>9191919191999</stamp>   <!-- Unique ID for each request -->
  </identification>
  <message>
    <refund>
      <stamp>636356238928109320</stamp> <!-- Original trade's stamp -->
      <reference>1</reference> <!-- api_reference OR original payment's reference -->
      <amount>50</amount> <!-- amount is in cents, maximum amount is the amount of original payment -->
      <receiver>
        <email>niko.lehtinen@checkout.fi</email>
      </receiver>
    </refund>
  </message>
</checkout>";

$encoded_xml = base64_encode($xml);

$postData = array(
    'data' => $encoded_xml,
    'mac' => strtoupper(hash_hmac('sha256', $encoded_xml, 'SAIPPUAKAUPPIAS'))
);


var_dump(postData("https://rpcapi.checkout.fi/refund2", $postData));

function postData($url, $postData)
{
    $context = stream_context_create(array(
        'http' => array(
            'method' => 'POST',
            'header' => 'Content-Type: application/x-www-form-urlencoded',
            'content' => http_build_query($postData),
            "verify_peer"=>false,
            "verify_peer_name"=>false,
        ),
        "ssl" => array(
            "verify_peer"=>false,
            "verify_peer_name"=>false,
        )
    ));

    return file_get_contents($url, false, $context);
}