Facebook runs its own payment system called Facebook Credits that developers must use for any virtual goods in your game. They support over 80 payment methods in over 50 countries, making it easy for Facebook users to purchase virtual goods from you. You have two options for dealing with credits with your users, either a direct payment for goods (e.g., $0.99 for a pink pony) or to purchase in-app currency to purchase other goods ($5.00 for 50 credits). If you design a game that has a store, it may make sense to leverage the “credits as currency” option as you can push some of the management of your in-game currency onto Facebook. For this service, Facebook retains a 30% cut of all transactions, which is on par with what Apple retains ...

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