private static extern void _FirebaseSetCallbacks(onValueChangedEventHandler valueChanged, onValueChangedEventHandler childAdded, onValueChangedEventHandler childRemoved, onValueChangedEventHandler childChanged, onValueChangedEventHandler childMoved, debugLogHandler debugLogger, onAuthSuccessHandler authSuccess, onAuthCancelHandler authFailure, onErrorHandler errorHandler);
private static extern void _FirebaseObserveValueChange(IntPtr firebase, onValueChangedEventHandler onChanged, IntPtr referenceId);
private static extern void _FirebaseSetCallbacks(onValueChangedEventHandler valueChanged, onValueChangedEventHandler childAdded, onValueChangedEventHandler childRemoved, onValueChangedEventHandler childChanged, onValueChangedEventHandler childMoved, debugLogHandler debugLogger, onAuthSuccessHandler authSuccess, onAuthCancelHandler authFailure, onErrorHandler errorHandler);