public function redirectToPaypal()
{
$parameters = Request::getRequestArrayFromString($request = null);
foreach ($parameters as $name => $param) {
if ($name == 'idSite' || $name == 'module' || $name == 'action') {
unset($parameters[$name]);
}
}
$url = "https://www.paypal.com/cgi-bin/webscr?" . Url::getQueryStringFromParameters($parameters);
Url::redirectToUrl($url);
exit;
}