Many modern online games and applications (such as EpicSeven or Genshin Impact ) do not rely solely on your phone to verify purchases. They send the transaction token back to their own servers, which then check directly with Google's API. Because the proxy server cannot fake a receipt with Google's actual cryptographic signature, server-side games will catch the exploit and can ban your account.
When the proxy server is active, attempting to buy an item inside a patched app triggers a Lucky Patcher dialogue box instead of the standard Google Play payment window. This dialogue offers three main configuration toggles: download proxy server for in app purchases lucky patcher