Mage2\Order\Controllers\OrderController::index PHP Method

    public function index()
    {
        $orderData = Session::get('order_data');
        $orderProductData = Session::get('cart');
        $orderStatus = OrderStatus::where('is_default', '=', 1)->get()->first();
        $orderData['order_status_id'] = $orderStatus->id;
        $order = Order::create($orderData);
        $this->syncOrderProductData($order, $orderProductData);
        Session::forget('cart');
        Session::forget('order_data');
        return redirect()->route('order.success', $order->id);
    }