I work at a museum that offers members access to our museum via an iPhone App. I'm looking for a way to avoid the member having to also present supplemental identification to confirm they are indeed the member. I originally thought I could query the phone's number and compare to the phone we have on file, but there is no accepted way to access the phone number directly through the SDK. Anyone else have a method to pre-validate a app user? Username/password validation is not what I'm looking for. I need something that isn't readily dissemanable/shareable.
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