Shopify checkout success event (Optional)

<!-- RetentionScience start -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/blueimp-md5/2.10.0/js/md5.js"></script>
<script type="text/javascript">
{% if first_time_accessed %}
  window._rsq = window._rsq || [];
    window._rsq.push(['_setSiteId', 'site_id']); // replace site_id with your static Site ID
    window._rsq.push(['_enableOnsite']); 
  {% if customer %}
   window._rsq.push(['_setUserId', '{{ customer.id }}']);
   window._rsq.push(['_setUserEmail','{{ customer.email }}']);
{% endif %}

/*** EVENT SPECIFIC CODE ***/
window._rsq.push(['_addOrder', { 'id':'{{ order.id }}', 'total':'{{ order.total_price | money_without_currency }}' }]); 
  {% for item in order.line_items %}
    window._rsq.push(['_addItem', { 'id':'{{ item.variant_id }}', 'name':"{{ item.title }}", 'price':'{{item.price | money_without_currency }}' }]);
  {% endfor %} 
    window._rsq.push(['_setAction', 'checkout_success']);
/*** END EVENT SPECIFIC CODE ***/

window._rsq.push(['_track']);

(function() {
  var rScix = document.createElement('script');
    rScix.type = 'text/javascript';
    rScix.async = true;
    rScix.src = ('https:' == document.location.protocol ? 'https://' : 'http://') + 'd1stxfv94hrhia.cloudfront.net/waves/v3/w.js';
(document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(rScix);
  })();
{% endif %}
</script>
<!-- RetentionScience end -->