The system of in-game purchases is built in such a way that charge of
funds without the knowledge of the player can not be possible.

It's very important to set a strong password and not let other people use your game.

If this happens, though, please send us a screenshot of the order that was done without your
permission. You can find information on how to check your purchase history in the customer support section of Google.

The screenshot must contain transaction number (GPA.xxxx-xxxx-xxxx-xxxxx)
and the date.