I'm looking at conversion tracking using Pixel:

https://developers.facebook.com/docs/meta-pixel/implementation/conversion-tracking

It is simple to do with:

fbq('track')

However, the page has multiple trackers and the site is advertised on multiple platforms. How can I confirm that the users session came from a FaceBook advert and not from a Google or Bing Ad before executing the track command via Pixel.

Is there anything built in to Pixel that allows us to confirm this is a Facebook referred session?