iOS app download referral rewards using Firebase

I am working on an iOS app using Expo and Firebase. We want to offer referral rewards to users who get others to download the app. Right now, we simply have a “Who told you about us” section when creating an account, but we’d like to be able to send out a referral code with the invite and track whether that user downloads the app, as described here. Unfortunately, I can’t seem to find how to do this with Expo specifically. I’d love some help with this :slight_smile: