Opencart duplicate module example

2018-07-01 Sunday: how to duplicate handling fee module in Opencart

Searching for handling fee related files in Opencart 2.3.0.2 root directory:

$ find . -name '*hand*'
./admin/view/template/extension/total/handling.tpl
./admin/language/en-gb/extension/total/handling.php
./admin/controller/extension/total/handling.php
./catalog/model/extension/total/handling.php
./catalog/language/en-gb/extension/total/handling.php

$