How to set up Google Analytics?
If you're not familiar with Google Analytics, here's an article to help you get started: Google Support: Get started with Analytics
In short, Google Analytics will expand the view and sale data you can work with to improve your sales.
Adding your Google Analytics property ID to Sellfy
While logged into your Sellfy account, navigate to Dashboard → Integrations → Apps → Google Analytics. You'll find this input field:
Gathering in-depth sales data (Enhanced Ecommerce)
See this article on Google support for more help:
While logged into your Google Analytics account, navigate to Admin → View → Ecommerce Settings. You'll need to enable both E-commerce and Enhanced Ecommerce Settings as well.