How to change order information on success order: Magento

Hello Friends! Hope you all are doing well! I am here going to describe you a important Magento script for change the order information on success order. Using my script, you can easily update recent order information like "customer group", "payment status", "order confirmation" etc.

/** Change Custom Payment Status */
                $orderId = Mage::getSingleton('checkout/session')->getLastRealOrderId();
                $order = Mage::getModel('sales/order')->loadByIncrementId($orderId);
                $order->setData('state', 'complete');
                $order->setStatus('complete');   
                $history = $order->addStatusHistoryComment('Order was set to Complete by our automation tool.', false);
                $history->setIsCustomerNotified(true);
                $order->save();
           /* End payment status */

  Enjoy script! :)