The Property ID identifies the property (website) being tracked. It is a structural identifier that describes your account setup rather than a single visitor.
Why the Property ID matters
Section titled “Why the Property ID matters”The Property ID forms the prefix of every Click ID, which is how AnyTrack knows which property a click belongs to. In server-side setups, you can send the Property ID joined to the Client ID ({propertyid}{cid}, 26 characters). AnyTrack matches that value to the latest event of the visitor before the conversion.