title: PHP file in module which can handle get requests from outside
body: <p>I'm trying to create module that will be able to handle get requests from outside. I would like to have a separate php file for get requests, also I would like to be able to use prestashop function and classes in this file. How to do that? I assume that I have to import something into this file, but what?</p>
  <p>I'm green as it goes for prestashop module development so please don't be harsh.</p>