Give each campaign a clear name
Use consistent tags so you can compare launches and channels. The UTM guide explains a naming approach. A browser may omit referrer information, so label links deliberately.
Compare clicks by campaign, device and available source information. Add imported overall Stripe or RevenueCat revenue to see trends alongside your traffic.
Availability depends on what the browser sends and the data retained by your plan. Missing referrers do not mean there was no campaign.
Start with the question you want to answer: which link received traffic, from which campaign, and during which period?
Free plan: 1 active links and 10,000 clicks/month.