It will be great if a customer could generate the PDF of an invoice.
Glenn Hermans commented
Great idea! this should be integrated by default and not as an extension.
A whole Bunch of such Extensions exist already for OpenCart.
But if OC would implement everything, there would be no more Room for Code-Developers, to generate Income as well as so financing the OC Development. And as a consequence of such, there would no longer be a FREE OpenCart, in the first place.
But sometimes, Peoples just expect much more, than thew would be willing, to give themselfs...
Version 188.8.131.52 is definitely also missing a invoice, delivery note or picking slip to PDF feature, with the option to email it
There are extensions that can do this in case anyone wants it in the meantime.
Petr Novák commented
Also the PDF invoice should be sent to the customers email as an attachment and also the Bussines Terms (accepeted with the order) should be included as a second email attachment. It is a legislation requirement in some EU countries.