How to include order details on the thank you page

How to include order details on the thank you page

Hi,
How to include order details on the thank you page?

$app =& JFactory::getApplication();
$app->enqueueMessage( '<br/>Order id: '.$this->order->order_id.'<br/>Order Number: '.$this->order->order_number );

or

$order = $this->order;
print $order->order_number;

Not working

Thanks

Aw: How to include order details on the thank you page

https://www.webdesigner-profi.de/joomla-webdesign/shop/plugins/checkout-finish.html?lang=de