in our app we will give 1000 dollars per account, we i have to limit the user to register many accounts. the userID you said, how to set it with device id or icloud id? now we use userid just the same with username. I also found there is a aaguid for authenticator, but we got "aaguid": "00000000-0000-0000-0000-000000000000" from iphone.
CouldAI
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