Credit card bill
I was billed by apple and I can't find out what value is that. I don't have any subscription and I didn't buy any app this month. How can I find out?
iPhone XR, iOS 14
See information in If you see "apple.com/bill" or an unfamiliar charge on your statement - Apple Support
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