Back in April, a federal court ruled that Amazon had not done enough to alert Kindle Fire owners — and users of Amazon’s Android appstore — that “Free” apps could still allow kids to make costly in-app transactions, but the ruling left unresolved exactly how much Amazon would need to pay to make customers whole again. Yesterday, the judge in the case determined that wronged Amazon customers must need to actively claim their refund, and that Amazon could not pay the refund in site credit or gift cards. [More]