This snippet is for adding tracking for a separate piece of analytic software you may have installed. The order object contains all the order data you should need, including line items.
You need to add this code to your child theme’s
functions.php file or via a plugin that allows custom functions to be added, such as the Code snippets plugin. Please don’t add custom code directly to your parent theme’s
functions.php file as this will be wiped entirely when you update the theme.