Create token for ajax call in custom module

[abmcr]

I have developed a custom module with a ajax call
In my controller i create a token with 

$token = Tools::getToken(false);

The token value is passed to the code javascript; into the js there is an ajax call to a file in /myModule/ajax.php

Tha ajax call collect into the post data the token value

 

Now how can validate the token data into the /myModule/ajax.php

// ajax.php

require_once dirname(__FILE__).'../../../config/config.inc.php';
require_once dirname(__FILE__).'../../../init.php';

//how to het the token value

Thank you

Edited November 24, 2016 by abmcr (see edit history)

[razaro]

Check also this http://build.prestashop.com/howtos/module/Common-mistakes-while-coding-module/

there is one tip about secure key. But do take notice on top comment there by shagshag, he gives

great example.

[abmcr]

Thank you.... now all work fine