/**
* Start pyament processing through Paypal.
* This method never returns.
*
* @param string $amount a single transaction's price
* @param unknown $localTrxID application transaciton object
* @throws PayPal_Exception_InvalidResponse
*/
public static function payment($amount, $localTrxID = null)
{
$impl = new PayPal();
$registration = $impl->registerTransaction($amount, $impl->storeLocalTrx($localTrxID));
Session::instance()->set(self::SESSION_TOKEN, $registration->id);
foreach ($registration->links as $link) {
if ($link->rel == 'approval_url') {
HTTP::redirect($link->href);
exit;
// shouldn't be needed, redirect throws
}
}
throw new PayPal_Exception_InvalidResponse('Missing approval URL');
}