PDF Invoice Pro for orders allows the generation of your order invoice in PDF format for Opencart. PDF Invoice can also be automatically attached to HTML email sent from the store. There are a lot of PDF settings within the extension to make your invoice look as per your requirements. All order related details can be added to the PDF Invoice.
It is available for admin and customer both. With different style and settings, you can increase the details of Invoice. PDF can also be controlled based on order status. Also, it provides with PDF HTML / twig file. So you easily edit and customize it as per your need.
So this file can be customized easily to make changes as per your customized need.