Step 1: Create a URL with UTM parameters:

Example: *https://newsletterdeepdives.beehiiv.com/?utm_source=meta&utm_medium=lalaudience&utm_campaign=a31*

UTM_source = Traffic source (Meta or Twitter)

UTM_medium = your ad set

UTM_campaign = your ad

This way, you’ll be able to track down to the ad where the subscriber came from.