"We are pleased the federal judge found Amazon liable for unfairly billing consumers for unauthorized in-app purchases by children," FTC chairwoman Edith Ramirez said. "We look forward to making a case for full refunds to consumers as a result of Amazon's actions."

The FTC and Amazon will present more information to the court before it decides how much money the company owes to customers. The FTC previously reached settlements with Apple and Google over similar charges, eventually resulting in refunds to customers totaling more than $50 million.