<script>
var orderID = "{{ Order.id }}";
var productInfo = [];
//Loop this for each product in the order
{% for OrderDetail in Order.OrderDetails %}
productInfo.push({
product_id: "{{ OrderDetail.Product.id }}", //規格を使ってればProductClassから取る
product_price: "{{ OrderDetail.priceIncTax }}", //税込ですが
product_quantity: "{{ OrderDetail.quantity }}",
product_name: "{{ OrderDetail.Product.name }}"
});
{% endfor %}
//End loop
</script>

        $Order = $app['eccube.repository.order']->find($orderId);
        return $app->render('Shopping/complete.twig', array(
            'orderId' => $orderId,
            'Order' => $Order,
        ));