Guideline 2.3.1 - Performance
We discovered that your app contains hidden features. Attempting to hide features, functionality or content in your app is considered egregious behavior and can lead to removal from the Apple Developer Program.
Specifically, we found that your app includes PGPay SDK, which provides access to external payment mechanisms and enables the purchase of content, services, or functionality by means other than the in-app purchase API.
If you feel that we have misunderstood how your app functions and that your app is compliant with the App Store Review Guidelines, please reply to this message in Resolution Center to explain how this feature works.
The next submission of this app may require a longer review time, and this app will not be eligible for an expedited review until this issue is resolved.