Freemius Purchase Completion JavaScript Callback Filter

purchaseCompleted.php

<?php
    function my_after_purchase_js( $js_function ) {
        return 'function (data) {
            console.log("checkout", "purchaseCompleted");
        }';
    }  
    
    my_freemius()->add_filter('checkout/purchaseCompleted', 'my_after_purchase_js');
?>

Hi,
would you elaborate where does this code goes. shell i add this code to the plugin header where Facebook pixel code already added or somewhere else?
Many thanks
irfan Qasim

There is a bug in my_freemius()->add_filter('checkout/purchaseCompleted', ''my_after_purchase_js);

It should be my_freemius()->add_filter('checkout/purchaseCompleted', 'my_after_purchase_js');

@irfan-blackandwhite put it in a PHP file that is included after your freemius code is initialized.

How does this code tie with the tracking of purchases with Google Analytics? I can see that the purpose is to return a JS function that will act as callback. The callback receives a data object, but it's unclear of what that object contains, and how it can be used to track the purchase. A more detailed example would be useful. Thanks.