18/01 2022 @Kofod95

A simple module that adds a button to the checkout_success page.
The button opens a new window with a printer-friendly invoice of the completed order. 
Credit goes to PhoenixCart core-developers, as the invoice is a copy of the one in admin with only a few modifications.

To install simply upload the content of the "catalog"-directory to the corresponding directories of your shop.
Copy and translate the English language-file as needed.
Go to your admin-backend. Find Modules->content and press "Install Module"
Locate "Invoice" in the "checkout_success"-group. Install and configure as needed.