Here at SocialPoint, all of our games are free to download but we do give the optional “in-app purchases” for players to take advantage of. Players do not need to purchase anything to play the game, but they can help to get more out of the game. In-app purchases are paid for with real money.
These packages are always clearly labeled to warn the users. You can find these packages “in game”, meaning that the options to make a purchase are found within the game itself.

You can manage the settings to make in-app purchases by adjusting password protection settings, or disable in-app purchases entirely through your mobile device’s general settings.
The way that this can be achieved is different for IOS and Android, so please see the manual of your device to change the settings you require.