How to see if Conversion API Data is being accurately passed to Facebook

Go to your Ad account, and in the left side bar click "All tools":

Then select the Events manager:

Then click on Data Sources:

Select the Data Source you want to check, and then in the bottom, you will see the events and if they are active or not:

If you click on any of the events, it will expand, and you will see how many was passed for the selected time period:

You can also click on View Details:

There you can see the Event Quality:

Anything above 8 is considered to be good quality