public function product($orderLineHandle, $product)
    {
        $products = new Product($this->client_raw);
        $productHandle = $products->getHandle($product);

        $this->client
            ->OrderLine_SetProduct(
                array(
                    'orderLineHandle' => $orderLineHandle,
                    'valueHandle' => $productHandle
                )
            );

        return true;
    }