Fire Facebook Pixel with for Free+Shipping Shopify Products

track.html

<script>
    {% if first_time_accessed %}
    var patchedTrack =  function(type, data) {
        data.revenue = "{{order.total_price | money_without_currency}}";
        window.ShopifyAnalytics.lib.track2(type, data);
    };

    function patchTrack() {
        if (window.ShopifyAnalytics &&
            window.ShopifyAnalytics.lib &&
            window.ShopifyAnalytics.lib.track != patchedTrack) {

            if (typeof(window.ShopifyAnalytics.lib.track2) === 'undefined') {
                window.ShopifyAnalytics.lib.track2 = window.ShopifyAnalytics.lib.track;
            }

            window.ShopifyAnalytics.lib.track = patchedTrack;
      }
  }

    patchTrack();
    setTimeout(patchTrack, 0);
    document.patchInterval = setInterval(patchTrack , 100);
    document.addEventListener("DOMContentLoaded", patchTrack);
    {% endif %}
</script>

Thanks for the gist!

Do I include this snippet in my "Additional scripts" checkout page?