Enable Enhanced Ecommerce tracking
To enable Google's Enhanced Ecommerce tracking:
From your Shopify admin, click Online Store, and then click Preferences (or press
Scroll down to the Google Analytics section and click the Use Enhanced Ecommerce checkbox:
Unless you're using the latest version of Google Analytics, you'll have to click Upgrade to the latest version:
If you're using an older version of Google Analytics, then you might need to click Upgrade to the latest version before you can click the Use Enhanced Ecommerce checkbox and then click Save.