Shopify
Tag Manager
Add Tag Manager to theme: Modify Theme
"online store" -> "..." or "Actions" -> "edit HTML / CSS"
Modify theme.liquid
Google Tag Manager will also need to be added to Checkout's additional settings to track conversions
Conversion Tracking Code
Google Tag Manager will also need to be added to Checkout's additional settings to track conversions
In "settings" -> "checkout" -> "additional settings"
<script>
var dataLayer = window.dataLayer || [];
dataLayer.push({'order_id' : '{{ order_number }}', 'order_value' : '{{ total_price | money_without_currency }}', 'event' : 'order-submitted'});
</script>