How you can detect app set up supply / deferred deep hyperlink on Android (Kotlin) and iOS (Swift) after net popup marketing campaign login?

I’m growing a cell app for each Android (Kotlin) and iOS (Swift), and I must establish the place the app set up got here from.

Use case

On the web site, we present a popup like:

“Set up the app and get a coupon”

Person stream:

1. Person visits web site

2. Person clicks popup/banner

3. Person installs the cell app from App Retailer / Google Play

4. Person opens app and logs in

5. App ought to know the set up got here from the online popup marketing campaign

6. Backend sends coupon to that person

What I wish to obtain

I wish to monitor:

• set up supply

• marketing campaign ID

• deferred deep hyperlink info

• attribution after first set up

• join net marketing campaign → app set up → person login

Questions

Android (Kotlin)

• Is there an official solution to detect set up referrer?

• Ought to I exploit:

• How can I cross marketing campaign parameters safely?

• Instance:

  myapp://coupon?marketing campaign=web_popup_001
  
  

iOS (Swift)

• Since App Retailer doesn’t assist set up referrer like Android, what’s the really useful method?

• Is Common Hyperlink + deferred deep linking the proper answer?

• Which service is usually utilized in manufacturing?

Further necessities

• Have to work after recent set up

• Person could set up app first and login later

• Want backend to establish marketing campaign and reward coupon

• Favor official or steady answer

What I already researched

However I’m unsure which method is really useful in 2026 for cross-platform apps.

I might admire:

Thanks!