Is the payment secure?
Yes, the payments are managed by Google, and the app developer doesn't get any information regarding your Credit card or whichever method you use for purchase.
What if I buy a new android phone or accidently clear app data?
No Worries! Your purchase is associated with your Google account, so your purchase will be automatically restored! When you install the ChessIs app on a new phone, please make sure that you are logged in with the same Google Account which you used to purchase ChessIs Pro, then Simply click on ChessIs Pro in the left menu and the purchase will be restored automatically.
If you have further questions, please feel free to email at chessimprovementapps@gmail.com