function runExternal(Destination $destination, $purpose)
{
$destination->setAmount($_POST['amount']);
$destination->setPurpose1($purpose);
$destination->setPurpose2($_POST['purpose1']);
$url = $destination->getUrl();
$params = http_build_query($destination->getParams());
$completeUrl = $url . '?' . $params;
header('Location: ' . $completeUrl);
}