We recently updated our applications minimum iOS to 10.0. For that app we were getting good downloads and revenue for devices running on iOS 9. When we try to download the app on iPad mini (iOS 9.3.5) we are getting an error message that the application is not compatible with this device. How will our new user running on iOS 9 be able to download this app? Is it possible that the last compatible version still be downloadable for new users? Thanks!

App Store guidelines state,Apps in the Kids Category should not include third-party analytics or third-party advertising.Can we use all other Firebase features like Authentication, Database & Remote Config excluding Firebase analytics?

I have added a auto-renewable subscription in my app. If I test the subscription during development everything works fine. But if I download it from testflight and make a purchase then, it shows "Purchased Successfully" but the latestreceiptinfo field of app store receipt does not show that subscription. How do I solve this?

I am working on grace period. I want to know if there is a way to test it. Also is it possible to create a billing error in sandbox?