Kindle users can't rent or buy books or pay for Kindle Unlimited subscriptions using the e-reader's Android app anymore, Amazon told customers in an email Tuesday. Instead, people will have to pay for content on a web browser and then access the books through their app's digital library. 

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

Google clarified 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 billing system isn't used for the sale of physical objects like groceries and clothes in apps or for peer-to-peer payments or purchases made in gambling apps.

Google takes a 15% cut of transactions on its Play Store billing system. The fee was cut from 30% in January.

The deadline for complying with the policy is Wednesday, at which point Google said it will remove non-compliant apps the Google Play store. Amazon has already implemented the change in version 8.58 of the Kindle app for Android, with the app displaying 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, as Apple required e-reader makers to remove links in their iOS apps that enabled people to make purchases in 2011, even if the links redirected to a website.