In-app purchases running up large bills on the Google play store. It is not always easy to spot an in-app purchase that charges you real money rather than in-game points or credits. If you are not careful, it is easy to spend hundreds or even thousands of pounds without realising it. These bills are your responsibility and not the responsibility of the laptop or tablet manufacturer.
Many games allow purchases of extra coins, credits, points, etc. It can be difficult to track exactly how much you have spent on these point or add-ons, or how many of these you have used when you play the game.
Method 1: Change the Google play store password behaviour
Note: It is a good idea to set the password on your Google account to be a different password to the one used to switch on or unlock your device.
Method 2: Remove your credit card information from Google Play
Note: This will stop ALL google play purchases without you adding another card. However you can buy pre-paid cards for the Google play store from most supermarkets, Boots, Currys, PC World, the Post Office, Amazon, and Shell Petrol stations. These will allow you to continue to make purchases on/with your Google play account but will limit any financial damage caused by accidental purchases if they are the only payment method on your account.