Can you have a referral system in your app, where each user is assigned a code. And when another user uses the code, they get a reward from it? I don't have subscriptions in my app, and I only have in app purchases where a user can buy 1, 3 or 5 scans which are all consumable. So when another user uses someone else's code, I keep track of it and when there is 2 uses of that code, the user can get a free scan. I got feedback from Apple saying: Guideline 3.1.1 - Business - Payments - In-App Purchase The app unlocks or enables additional functionality with mechanisms other than in-app purchase, which is not appropriate. Specifically, the app uses Referral codes to unlock or enable Face scans. Next Steps It would be appropriate to remove these features from the app and any other feature that unlocks or enables functionality with mechanisms other than the App Store. Is there a way to make this work while adhering to the guidelines? Do I need to have it as a in-app currency? And that would be allowed?