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Scenario: I am developing a free app for use only by registered members of a website. Their permissions to access features of the app are stored remotely. I would like users of the app to register only once the first time the app is used.

Proposal: On launch use identifierForVendor to check a remote table of registered users to get the userID and thus their permissions. If identifierForVendor is not found then prompt for their website username and password. These would be used once and discarded. If they identify a valid member add the identifierForVendor:userID to the registered user table for future login.

Questions: Are there flaws with this design? What are they? Are there examples (my searchfoo has failed)? Are there standard ways of doing this?

Thanks in advance for any direction.

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