Security breach on Apps Store
Someone is using Apple ID to purchase games on the apps store.
iPhone XS Max, iOS 14
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See the information in If you see 'apple.com/bill' or an unfamiliar charge on your statement - Apple Support including the following:
Anyone who has your Apple ID password can make charges to your account. If you have unauthorized charges, change your Apple ID password.
Also, if the only indication of the charges is from an email or text, be aware that it may be a phishing attempt to get you to log in to a site that appears to be Apple and divulge your password or credit card information. See: Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support
and Identify legitimate emails from the App Store or iTunes Store - Apple Support