Amazon let customers know on Tuesday they can no longer rent or buy books or pay for Kindle Unlimited subscriptions using the Kindle app. In an email, the company explained people will have to pay for the digital content on a web browser and then access the books through their app's digital library. 

The change was necessary "to remain in compliance with updated Google Play Store policies," Amazon said in the email.

The notification went out one day before a deadline set by Google to comply with the policy. The Android maker said in 2020 that apps must use the Google Play billing system to charge for "in-app features and services," which include digital content in addition to subscription services, upgraded versions of a free app and cloud services like data storage. The company later gave app developers until June 1, 2022, to comply.

Google takes a 15% cut of transactions on its Play Store billing system. The fee was cut from 30% in January. The billing system isn't used for the sale of physical objects like groceries and clothes or for peer-to-peer payments or gambling that takes place on apps.

Google said it will remove non-compliant apps from the Play Store starting on Wednesday. Amazon implemented the change in version 8.58 of the Kindle app for Android. The app displays a notification that in-app purchases and rentals aren't available.

The company has also reportedly disabled in-app purchases on its Audible and Music apps, in addition to removing digital purchasing features on its Shopping and Prime Video apps.

iPhone users are already familiar with this arrangement for the Kindle app. Apple required e-reader makers to remove links in their iOS apps that allowed people to make purchases in 2011, even if the links redirected to a website.