According to version notes the In-app Billing version 5 was released on February 2015. Version Notes
I am having trouble finding the IInAppBillingService.aidl describing the updated interface.
I have updated Google Play Billing Library through SDK Manager to Rev. 5, but the /extras/google/play_billing directory contains only IInAppBillingService.aidl describing interface without the new methods.
Is it not available yet?