$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api.megawin.be/order/delete/');

$array = array();
$array['guid'] = '000000-000000-000000-000000-000000';
$data = json_encode($array);

$headers = array();
$headers[] = 'X-Api-Key: xxxxxxxxxxxx';
$headers[] = 'Content-Type: application/json';
$headers[] = 'Accept: application/json';

curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch,CURLOPT_POST, count($data));
curl_setopt($ch,CURLOPT_POSTFIELDS, $data  );
curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT ,3);
curl_setopt($ch,CURLOPT_TIMEOUT, 20);
		
$result = curl_exec($ch);

if (curl_errno($ch)) {
    echo 'Error:' . curl_error($ch);
}

curl_close($ch);