Amazon resists a request by the Federal Trade Commission to require a password for in-app purchases using their application store. They say they are willing to go to court over this issue. A FTC spokesperson says:
The commission is focused on ensuring that companies comply with the fundamental principle that consumers should not be made to pay for something they did not authorize.
However, Amazon claims in a letter to the FTC that they refund applications purchased accidentally:
When customers told us their kids had made purchases they didn’t want, we refunded those purchases.