How do you find out which post or creator brought your app's paying users?

Hi all, I'm Marin. I build small mobile apps, and Unolink launches here on Tuesday.

Before launch, I'd love to hear how other app makers handle this:

When installs jump after a TikTok, a creator mention or a Reddit post, how do you work out which one it was, and whether those people actually paid?

The ways I've seen:

• Lining up post times with the install chart

• A "how did you hear about us?" screen in onboarding

• Promo codes per creator

• App Store Connect campaign links and Play Console UTM tags

• A full attribution platform (AppsFlyer, Branch, Adjust)

I built Unolink because none of these told me the whole story for a small app: one link per post that opens the right store, then installs, paywall views and payments per link.

What do you use, and what's missing from it? Honest answers welcome, including "I don't bother".