To help you track impressions, and add a third party verification to Facebook's data (or any other network's), you can make use of View Tags.
Only a handful are whitelisted by Facebook - you can find the list here!
How can I set them up?
On the Paragone platform, you can very easily set them up.
As View Tags help track impression, they are triggered when the ads are loaded on the user's platform.
For you to set them up, you need to go to the Summary after you built your Campaign, and open each of the Ad Sets.
Each of the ads will have an input field for a view tag!