TL;DR :
Changes to Google Play’s billing requirements for developers serving users in India
If a user pays through an alternative billing system, the Google Play service fee will be reduced by 4%

Blog post :
• https://blog.google/intl/en-in/updates-to-android-and-google-play-in-india/

Knowledge Base :
• https://support.google.com/googleplay/android-developer/answer/13306652
• https://support.google.com/googleplay/android-developer/answer/13321562