Bigcommerce
Tag Manager
https://support.bigcommerce.com/articles/Public/Accessing-and-Customizing-Template-Files
To Add GTM:
- Click on Storefront > My Themes - Click on Advanced > Theme Editor - Under Templates, find base.html & add both sections here
Adding Conversion Tracking
Advanced settings -> Affiliate Conversion Tracking
This also requires the tag manager to be inputted into the "Affiliate Conversion Tracking" section as well
Conversion Tracking Code
<script>
var dataLayer = window.dataLayer || [];
dataLayer.push({'order_id' : '%%ORDER_ID%%','order_value' : '%%ORDER_AMOUNT%%', 'event' : 'order-submitted'});
</script>
Feed
A plugin is required to be used.
A possible paid plugin is:
https://www.bigcommerce.com/apps/google-shopping-by-sales-orders/
API
An API exists which can open up a possibility to create our own feed.
https://github.com/bigcommerce/bigcommerce-api-php