It's not real money, thus also not the applicable law for a purchase money be applied. It is not the German buyers right. For me an InApp purchase went wrong and then I have to write between Amazon and the APP-traders often back and forth (Amazon and the APP dealer take no case directly on the contact! Both make reference to the other. The purchaser is in lack of evidence. How has an InApp purchase to? The purchase was then reversed from "goodwill". I think because I had been lucky. If all goes well, no problem, but if an error occurs, the buyer is on his own.