Web Paywall Initial Converstion Rate Calculation

I am going to integrate Web Paywall Links as a way to purchase a subscription for my mobile app.

I am wondering if a trial start rate or initial conversion rate can be accurately assessed for customers who’s first touchpoint with RevenueCat is through a Web Paywall link.

I create a user in my database and use their database user id as the unique id for the paywall link. When a link is visited with a unique id, will that register a “First Seen” type of event in RevenueCat?

If not, I can track page views and user ids in my backend, but would like to know if there’s a seamless way to integrate that info with RevenueCat. 

Thanks!