After a stinging rebuke in the lower courts over its legal battle with Epic, Apple filed a notice of appeal to the Ninth Circuit on Monday. The appeal will challenge last week’s ruling that prevents the company from charging developers fees on purchases made outside the App Store.

Apple has filed its appeal against an App Store ruling that forced it to remove restrictions for apps with third-party payment links.

Apple has changed its App Store rules in the U.S. to let apps link users to their own websites so they can buy subscriptions or other digital goods. This