I am playing Pokemon Go using Google account 1. I then redeemed my Google Play gift card to the same account. Then when I try to go to the Pokemon Go shop, hoping to use the balance in Google Play account to buy coins, Pokemon Go shows the Google Play store page again, but with another Google account 2. This is the default account set in my Android mobile phone. How can I switch the account back to account 1 in Pokemon Go, so that I can use the balance inside the Google Play account 1?