Google Play Help

Hello all,

I have been playing "goodgame empire four kingdoms" on my phone, which is a medieval war game app. The app lets you purchase items using your google play account and the purchases are directly taken from my bank account.

I want to quit the app/game and pass my login and password to my friend to allow him to take over the account and carry on playing on a separate device. However, i do not want my friend to be able to make purchases from my bank.

If my friend logs in to the game using his own device, will it have any links to my google play account details through the app and in turn my bank account?

I have only used google play to pay for items on this app and am not really sure what would happen if it is accessed via another device.

Please help :-)