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"You have money in your Google Play balance, which won't be carried over when you change your country. You'll be able to change your country when you have less than R$22.00 left."

looks like I...

How do I change my currency to USD?

Yes but I got this currency error http://a.pomf.se/ofpvbz.png

I bought a google play card to get AC with PSO2es but when I try to buy it says "Currency not supported" and the money went to my balance before buying so I couldn't know that it wasn't going to...

There is a friend that wants to buy AC through PSO2es with gift cards for me but we have some problems
He lives in the US and I live in Brazil.

Does US Google play gift cards in other countries...