Shopify sent me an email today:
"Our developers and the team at Facebook have definitely noticed a large increase in these errors, and it appears to be due to an updated implementation in Facebook's CAPI version 2.
We have heard back from Facebook, and they have noted that these errors will not be impacting Pixel performance on your store. As well - they have notified us that Facebook has removed the new instances of this error related to External ID not matching. Can you please review your Facebook Pixel, and let us know if you're seeing any new instances of this error? The error may still exist historically in the data of your Pixel, but going forward Facebook has mitigated this issue."
Today stats are the same, shitty as they were, no atc, no purchase data, half the view content.
I ignored the errors, will see.
Anyone seeing normal stats? Shopify claims this was fixed but my stats are still really low.
In preparation for this, our developers pushed out some changes and they triggered the Pixel warnings you have seen in your Event Manager. Our developers have confirmed with Facebook that these changes weren't affecting the existing Pixel events that are being sent via browser or the purchase event being sent via server. Facebook has also confirmed that they have prevented these warnings from appearing again so you can dismiss them by clicking Mark as resolved in your Event Manager and the warnings won't reappear.