I am a USA based player todays in store purchases are asking for payment in GBP
From my understanding, Google Play controls the checkout process completely on Android, without any input from the game.
I would check with Google Support to see if something is configured wrong with your account. This link might help as a starting point:
Awesome, glad you got it resolved! 
Just to let you know…those are British Pounds and not Euros (€) 
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