In shofify

Configuring Your Profile
In this screen you need to enable E-Commerce website and correct the currency and other options you see

Click save and you will land back on the tracking, here we click on check status or similar

From this screen we now have to extract the proper Google Analytics tracking name. It should be in the format UA-xxxx-xx. The name can be found in the middle of the javascript:

Shopify will now automatically add the proper Google Analytics tracking codes to all of your pages. You should see e-commerce tracking appear the next time Google Analytics updates.