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on Thursday said it would cut the company’s App Store fees from 30% to 15% for some app makers, if they enter into a new program administered by the iPhone maker.

The Mini Apps Partner Program offers app developers the better fee in exchange for using some of Apple’s technology to build their apps. This includes using Apple software to register a user’s purchase history, verify user ages and to process in-app purchases.

A “mini app” is a lightweight piece of software inside a third-party app store, like that of Discord’s. These apps uses are built using web technology like HTML or Javascript.

Most notably, China’s WeChat offers offers millions of mini-apps built by other developers to let users track packages, look up transit directions and shop online. Artificial intelligence companies like OpenAI are increasingly integrating mini apps inside their chatbots.