PHP Postback URL

I would like to know how to get variables from postback url so I can insert them into database.

Example:

When something is done on other website and not mine, website pings me back like:

What exactly now do I need to put in postback.php file so I can get those variables and use them to update the database I'm connected to?

Solution

The response from the other website is a basic GET request You can access those variables in your postback.php file with the $_GET var

$id = $_GET['id'];
$token = $_GET['token'];

(SQL Insert there)