1 Performance: App Completeness 3. 1.1 Business: Payments - In-App Purchase 4. 2 Design: Minimum Functionality Hello, We are not able to provide feedback on app concepts or features, but we recommend evaluating your suggestions against the App Store Review Guidelines, as well as the iOS Developer Program License Agreement (PLA), and the iOS Human Interface Guidelines. Additionally, if you are considering implementing any of the following functionality, we recommend reviewing all associated reference material and other resources available on Apple Developer for any additional requirements. Apple Developer Apple Copyright and Trademark Guidelines Game Center iCloud In-App Purchase You may also choose to post a question in the Apple Developer Forums. Best regards, App Store Review This is the message we received, we get the part with the design and we are confused about the in-app payments. Are they mandatory?