A US judge on Friday ruled in a major antitrust lawsuit against Apple’s App Store, striking down some of Apple’s restrictions on how developers can collect payments from users.

The ruling came as part of a lawsuit brought by Epic Games, the creator of Fortnite. Epic accused Apple of running its App Store as a monopoly, exercising too much power over what apps are allowed and how they are run. It took aim at Apple’s in-app purchase policies, under which it charges developers up to 30% commission on profits.

Friday’s ruling strikes down a core part of Apple’s App Store rules, which prohibit developers from telling users about other places they can go to pay the developer directly rather than using Apple’s payment mechanisms.

Judge Yvonne Gonzalez Rogers issued a nationwide order that allows developers to put into their apps “buttons, external links, or other calls to action that direct customers to purchasing mechanisms”.