in-app
adjective [ before noun ] uk/ˈɪnˌæp/ us/ˈɪnˌæp/
（计算机或手机）应用程序所提供的
done or available from within an app (= piece of software for your phone or computer that has a particular purpose)
in-app advertising/billing 应用程序中带的广告／支付机制
The map feature is available as an in-app purchase.