How to change the order form in opencart?

Question

opencart

In opencart, it is possible to customize the form type in the invoice.tpl file, but how to substitute other variables there? Let's say I need to insert only the name of the buyer in one field, but how to refer to the variable that contains the user's name?

Answer 1

It is necessary to transfer data in variables from the invoice.php controller.
For OpenCart 3 I have a PDF Invoice module that generates an invoice form in PDF and this form can be customized. Also, this invoice can be sent to the customer's mail when ordering.