Detect if user is signed in in the iTunes store

Is there any way to detect from your app (without using any private api) to detect if the iPhone (iOS) user has iTunes Store signed in or not?

How do I see who is logged into my iTunes?

You can access this list in three places: Via the Apple ID website: Go to appleid.apple.com, click Sign In, and log in with your credentials. Click Devices in the left-hand menu bar. In iOS/iPadOS: Go to Settings > Account Name and swipe down until you see your devices.

How can I tell if someone has logged into my Apple ID or iCloud?

Look at the Devices section. Click on Details. You will see all the devices signed in with your Apple ID. If you have changed your password, anyone else would have been kicked out and may not appear here any longer.

How can I tell if someone is signed into my iPhone?

If you're running iOS 16 or later, see How Safety Check on iPhone works to keep you safe. Check which devices are signed in to your account by going to Settings > [your name]. If you see a device you don't recognize, tap on that device name and select “Remove from Account.”

There is no way for you to detect if the user has signed into their account in the app store.

Is there a particular reason why you are looking for this functionality? Your app should not worry about this.