How do I report unauthorized use of my Apple ID on a purchase made today?

If this is an email you received, has your credit card been charged? Are you sure the message is legitimate? Does it contain a link for you to sign in somewhere? It may be a scam. Check your purchases history.

 Purchase History Review. https://support.apple.com/en-us/HT204088

Please contact Apple ID Support:

https://support.apple.com/apple-id