Constants
The following constants are available globally.
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                  A notification with the specified name is sent to the default notification center ( NotificationCenter.default) each time a Firebase app check token is refreshed. The user info dictionary containskFIRAppCheckTokenNotificationKeyandkFIRAppCheckAppNameNotificationKeykeys.DeclarationSwift static let AppCheckTokenDidChange: NSNotification.Name
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                  userInfokey for theFirebaseApp.nameinAppCheckTokenDidChangeNotification.DeclarationSwift let AppCheckTokenNotificationKey: String
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                  userInfokey for theAppCheckTokeninAppCheckTokenDidChangeNotification.DeclarationSwift let AppCheckAppNameNotificationKey: String
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                  Firebase app check error domain. DeclarationSwift let AppCheckErrorDomain: String