Include Google Analytics tracking in freemius checkout

freemius-google-analytics.js

<script src="https://checkout.freemius.com/checkout.min.js"></script>
<script>
    var handler = FS.Checkout.configure({
        plugin_id:  'xxxxx',
        plan_id:    'xxxxx',
        public_key: 'pk_yyyyyyyyyyyyyyyyyy',
        image:      'https://yyy.com/Logo-SVG.svg'
    });
    
    jQuery('.purchase, a[href*="#purchase"').on('click', function (e) {
        handler.open({
            name     : 'My awesome Plugin',
            licenses : 1,
            // You can consume the response for after purchase logic.
            purchaseCompleted  : function (response) {
                // The logic here will be executed immediately after the purchase confirmation.                                // alert(response.user.email);
            },
            success  : function (response) {
                // The logic here will be executed after the customer closes the checkout, after a successful purchase.                                // alert(response.user.email);
            },
	    purchaseCompleted: function( response ) {
		if ( typeof gtag !== undefined ) {
		    gtag('event', 'purchase', {
		        'value': response.purchase.initial_amount,
		        'currency': 'USD'
		    });
	        }
	    }
        });
        e.preventDefault();
    });
</script>