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Google play credit help?

So I have a couple of different Google accounts - one of them when it comes to playing games will always show up when I click to buy something in the game and I can't change it. 

I have another account for that Google play rewards app - where you answer questions for Google play credit. But I can't change which account shows up when I buy things so I can't use the credit. How do I change which account shows up

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