gistfile1.txt

    public function sendVendorNotification($po, $comment='')
    {
        $vendor = $po->getVendor();
        $method = $vendor->getNewOrderNotifications();

        if (!$method || $method=='0') {
            return $this;
        }

        $data = compact('vendor', 'po', 'method');
        if ($method=='1') {
            $this->sendNewPoNotificationEmail($po, $comment);
        } else {
            $config = Mage::getConfig()->getNode('global/udropship/notification_methods/'.$method);
            if ($config) {
                $cb = explode('::', (string)$config->callback);
                $obj = Mage::getSingleton($cb[0]);
                $method = $cb[1];
                $obj->$method($data);
            }
        }
        Mage::dispatchEvent('udpo_send_vendor_notification', $data);

        return $this;
    }