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?
Found the answer elsewhere. You need to uninstall the app on your phone and install it using the correct account FROM THE PLAY WEB STORE. On your computer. After I did that I had the correct account when I made purchases from the Pokemon Go shop.
I didn't have to remove any of the other accounts on the phone. I am using a different account to pay for purchases than I am for playing pokemon go.