Installation guides
Shopify
Connect your Shopify store and Calmstats installs the script for you.
You don't need to paste a script on Shopify. Connecting your store in Settings → Revenue installs the Calmstats script on your storefront for you and imports your orders, so you get visitors, revenue and attribution from one step.
Follow the Shopify revenue guide to connect your store.
If you already added the script to your theme by hand, you can remove it after connecting: the connection installs it, and visits aren't counted twice either way.