All purchases in the in-game Store are made via Google Play. Available payment methods depend on your country of residence. The main payment methods are:
● credit or debit cards: Visa, MasterCard, Amex and other local cards (like Elo credit cards in Brazil);
● payments via mobile operators: depends on the country of residence and mobile operator (the full list can be found here);
● Google Play gift cards: available only in certain countries (the full list can be found here);
● Google Wallet: available only in the U.S. and United Kingdom.
After you complete your first purchase, your chosen payment method will be added to your Google profile as default.
For more information about the payment methods available in your country, please follow the link.