php-apple-signin
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Is verification useful?
This program can verify if the identityToken is valid with clientUser. But it didn't verify if the clientUser is from the app I wish to verify (Service ID, Team ID) Meaning any apps can verify and return true in this program..
I think that user string is unique so it can not exist in any other app's scope, if I am understanding you correctly.
To my knowledge, this package's verifyUser function is safe and secure verification if the user is valid.