Marketing Cloud: Tracking Purchases in Shopify

<script type="text/javascript" src="//MID.collect.igodigital.com/collect.js"></script>
{% if first_time_accessed %}
<script>
  _etmc.push(["setOrgId", "MID"]);
  _etmc.push(["trackConversion", { "cart": [
{%- for line_item in order.line_items -%}{"item" : "{{ line_item.product.handle }}", "quantity":  "{{ line_item.quantity }}",  "price" : "{{ line_item.product.price | money_without_currency}}", "unique_id" : "{{ line_item.sku }}" },{% endfor %}
  ]}]);
</script>
{% endif %}