NOT ALWAYS GET WHAT YOU PAID.
Over time it happened to me 3 times that in-app purchases were indeed debited from Amazon, but did not show up in the game. In such a case you have lost because namely show the support of Amazon and the support of Electronic Arts or FireMonkey with the fingers together. They accuse each other and the customer is the rain and gets nothing for his money.
Now EA is not for its customer famous, but that Amazon can hang a customer so new to me, and grossly disappointing.
My advice, therefore: use at RR3 only small sums, whose loss you can not bear, in an in-app purchase.