Google on Monday said that it plans to start a rule which requires Android apps in Play Store to use its payment system, which takes a 30% cut of transactions.

“We have clarified the language in our Payments Policy to be more explicit that all developers selling digital goods in their apps are required to use Google Play’s billing system,” product management vice president Sameer Samat said in a blog post.

Apps that are offered on the Play Store’s virtual shelves have always required to use its payment system, which charges a 30% commission as per industry standards. 

For iOs powered devices, Apple does the same. However, unlike Apple, Google had been casual about enforcing the rule. It said that the policy was applicable to fewer than 3% of developers that have apps on the Play Store.

“We only collect a service fee if the developer charges users to download their app or they sell in-app digital items, and we think that is fair,” Samat said.

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Changes coming to the next version of Android, due out next year, will make it easier for people to use other app stores while watching out for user safety, according to Samat.

“Even if a developer and Google do not agree on business terms the developer can still distribute on the Android platform,” Samat said.

“This is why Fortnite, for example, is available directly from Epic’s store or from other app stores including Samsung’s Galaxy App store.”

Apple and Google in August pulled video game sensation Fortnite from their mobile app shops after its maker, Epic Games, released an update that dodges revenue-sharing with the tech titans.

The latest version of Fortnite contains a payment system that lets player transactions bypass Apple’s App Store and Google’s Play, preventing the firms from collecting their typical cut.

Epic quickly filed a federal lawsuit against Apple, accusing the iPhone maker of wielding monopoly power.

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The suit said Epic is not seeking favorable treatment, but is asking the court to order Apple to change its commission structure for all developers.

Apple said Fortnite was pulled after “Epic Games took the unfortunate step of violating the App Store guidelines that are applied equally to every developer and designed to keep the store safe for our users.”