Fraudulent charges
How to find source of fraudulent charges on my account
iPhone SE, iOS 13
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How to find source of fraudulent charges on my account
iPhone SE, iOS 13
Find the source in not an easy thing to do, and doing so is essentially a police matter that I can't advise you on. But, I can suggest some security-related documents, that may help you in the future.
If you think your Apple ID has been compromised https://support.apple.com/en-us/HT204145
Security and your Apple ID https://support.apple.com/en-us/HT201303
iCloud security overview https://support.apple.com/en-us/HT202303
Ways to keep your information safe on Mac https://support.apple.com/en-gb/guide/mac-help/mh11402/mac
Using app-specific passwords https://support.apple.com/en-us/HT201355
UseTwo-factor authentication for Apple ID https://support.apple.com/en-us/HT204915
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Also assuming you already are using two-factor authentication, you can periodically Check your Apple ID device list (https://support.apple.com/en-us/HT205064) and remove any device that shouldn't be signed in using the steps in the link.
If there are none that shouldn’t be signed in, then you should not have a problem at this point. But, if an unauthorized device signed in, Change your Apple ID password https://support.apple.com/en-us/HT201355
Here is What to do after you change your Apple ID or password https://support.apple.com/en-us/HT204071
See the Apple Support article(s) below.
Fraudulent charges