unknown charges on my credit card by Apple.com
I have been charged on my credit by Apple.com/Bill for a service that doesn't show in the subscription and I only have 1 apple id.
iPhone 12 mini, iOS 15
Did you already follow the steps in this article to find out more about your payment?
If you see 'apple.com/bill' on your billing statement - Apple Support
If you checked reportaproblem.apple.com and your emailed receipts and you're still not sure why you were charged, contact Apple Support.