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- /// @file FIRUserPropertyNames.h
- ///
- /// Predefined user property names.
- ///
- /// A UserProperty is an attribute that describes the app-user. By supplying UserProperties, you can
- /// later analyze different behaviors of various segments of your userbase. You may supply up to 25
- /// unique UserProperties per app, and you can use the name and value of your choosing for each one.
- /// UserProperty names can be up to 24 characters long, may only contain alphanumeric characters and
- /// underscores ("_"), and must start with an alphabetic character. UserProperty values can be up to
- /// 36 characters long. The "firebase_" prefix is reserved and should not be used.
- /// The method used to sign in. For example, "google", "facebook" or "twitter".
- static NSString *const kFIRUserPropertySignUpMethod = @"sign_up_method";
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