In the past we've been able to track all transactions with GA without any issues. Today however, GA notified us that Ecommerce data was missing and no data is flowing. We've followed all steps to activate ecommerce tracking in GA and it worked perfectly fine until today. We've also checked in shopify and GA and the settings are correct. Any thoughts on this?
Are you getting sales firstly? Google will say that if you're not.
You should also have an unfiltered view setup with ecommerce data to diagnose these issues. Filters are the most common cause of this if a problem exists.