Read the Apple ID out of my iOS App - ios

I wouldlike to know if it is possible to read out the apple id or any personal data from the mobile phone?
We are planning to create a sensitive data app for clients and we wouldlike to assure them that we arent aware about the apple id or any other sensitiv data.
Does someone has expirience with this?
Best regards
Rayk

There is no way to get users Apple ID from an iOS app, Apple is all about privacy and the last thing they want to do is share users Apple ID with anyone

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