function products_shipping_total($total = null, $order_id = null, $order = null, $items = array(), $shipmethod = null) {
        global $wpcoDb, $Order, $Item, $Product, $wpcoShipmethod;
        $productsshipping = 0;

        if (!empty($order_id)) {
            if (!empty($order)) {
                if (!empty($shipmethod)) {
                    if (!empty($items)) {
                        foreach ($items as $item) {
                            if (!empty($item -> product -> type) && $item -> product -> type == "tangible") {
                                //BEG additional product shipping cost
                                if (!empty($item -> product -> shipping) && $item -> product -> shipping == "Y") {
                                    if (!empty($item -> product -> shiptype)) {
                                        switch ($item -> product -> shiptype) {
                                            case 'tiers'            :
                                                if (!empty($item -> product -> shiptiers) && is_array($item -> product -> shiptiers)) {
                                                    $s = 1;

                                                    foreach ($item -> product -> shiptiers as $tier) {
                                                        if (($item -> count >= $tier['min'] && $item -> count <= $tier['max']) || $s == count($item -> product -> shiptiers)) {
                                                            $productsshipping += ($tier['price'][$order -> shipmethod_id] * $item -> count);
                                                            break 1;
                                                        }

                                                        $s++;
                                                    }
                                                }
                                                break ;
                                            case 'percentage'       :
                                                global $Product;

                                                if (!empty($item -> product -> shippercentage) && is_array($item -> product -> shippercentage)) {
                                                    if (!empty($item -> product -> shippercmethod)) {
                                                        if ($item -> product -> shippercmethod == "wholesale" && !empty($item -> product -> wholesale)) {
                                                            $newproductshipping = ((($item -> product -> wholesale * $item -> product -> shippercentage[$shipmethod -> id]) / 100) * $item -> count);
                                                        } elseif ($item -> product -> shippercmethod == "fixed") {
                                                            $newproductshipping = ((($Product -> unit_price($item -> product -> id, $item -> count, $item -> id, false, true) * $item -> product -> shippercentage[$shipmethod -> id]) / 100) * $item -> count);
                                                        }

                                                        if (!empty($newproductshipping)) {
                                                            $productsshipping += $newproductshipping;
                                                        }
                                                    }
                                                }
                                                break;
                                            default                 :
                                                if (!empty($item -> product -> shipfixed) && is_array($item -> product -> shipfixed)) {
                                                    $productsshipping += ($item -> product -> shipfixed[$shipmethod -> id] * $item -> count);
                                                }
                                                break ;
                                        }
                                    }
                                }
                                //END additional product shipping cost
                            }
                        }
                    }
                }
            }
        }

        return $productsshipping;
    }