if your friend has the game, you can just use his ID temporarily, and then download the game onto your machine. Then with your own account you can play the game. You don't need to log into his account in the future after that.

my friend did it but sadly wasn't the buyer

like I have two accounts, one for the aussie store and one for the asia one.. I downloaded it with the asia account, then played with my aussie login
haha I just want to play with aussie playerss..
oh well if anyone would like to help me out, please do so
cheers