iTunes
Why am I getting multiple charges on my account when I have a subscription?
iPhone X, iOS 11
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See: If you see 'itunes.com/bill' or an unfamiliar charge on your statement - Apple Support
Also, if you have a subscription to Apple Music, be aware that gives you rights to listen as long as you continue to subscribe but it does not prevent you from also purchasing music through iTunes. You would retain the rights to the purchased music indefinitely regardless of any subscription status. To download Apple Music without an additional charge, see: Add and download music and video content from the Apple Music catalog - Apple Support