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The review message:We continue to find that your app contains hidden features or functionality that can change the behavior of the app after review. To resolve this issue, it would be appropriate to ensure that all features and functions in the app are visible and fully accessible during review.It would also be appropriate to remove all third-party payment mechanisms from the app. Alternatively, if you believe this mechanism to be used in a manner that is compliant, please reply to this message in Resolution Center to explain how this feature works.But I am sure that there are no hidden features in my app, and also no third-party payment library, what can i do to explain?