The lawsuit was brought in 2012 by two children and their parents. It claimed the children racked up hundreds of dollars in purchases of Facebook Credits, a since-discontinued currency used by the site.
Under the settlement approved by a California federal court in May, Facebook agreed to add an option for requesting an in-app purchase refund on the grounds that it was made by a minor. It also agrees to have a dedicated team to handle such requests.
Menlo Park, California-based Facebook hasn't responded to a request for comment.
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