// Products
$order_data['products'] = array();
foreach ($this->cart->getProducts() as $product) {
    $option_data = array();
    //...
    $order_data['products'][] = array(
        'product_id' => $product['product_id'],
        'name'       => $product['name'],
        'model'      => $product['model'],
        'option'     => $option_data,
        'download'   => $product['download'],
        'quantity'   => $product['quantity'],
        'subtract'   => $product['subtract'],
        'price'      => $product['price'],
        'total'      => $product['total'],
        'tax'        => $this->tax->getTax($product['price'], $product['tax_class_id']),
        'reward'     => $product['reward']
    );
}

$this->model_checkout_order->editOrder($order_id, $order_data);

$this->model_checkout_order->addOrderHistory($order_id, $order_status_id);

$this->db->query("DELETE FROM " . DB_PREFIX . "order_product WHERE order_id = '" . (int)$order_id . "'");
$this->db->query("DELETE FROM " . DB_PREFIX . "order_option WHERE order_id = '" . (int)$order_id . "'");