I have $10 in Google Play credit on my account axusgrad. The account I originally installed was axus, so when I try to buy L2 upgrade it uses that Google account which had no credit. I tried uninteresting game and reinstalling while axusgrad account is active, but no luck.

I always see the axus email address when I try to buy L2, how can I select my other Play account for purchasing?

Hey, I figured out a workaround! On Android, pull down the menu and click the top right icon for 'user'. Then create a whole new user for your phone. Add only the account you want to use for purchasing, then 'install' Subterfuge for that user.

After that, I could buy the L2 upgrade with my credit. Now I just gotta delete the second Subterfuge account I made while trying to solve this problem, since I only need my one.