Using different payment methods in google play store distributed app

Question

I want to sell premium accounts through In-app purchases in my android application. Am I allowed to use different payment methods (like PayPal and Paymill) instead of Google Play In-app billing?

It seems that subscription payments are only allowed using the payment method provided by Google (https://developer.android.com/google/play/billing/billing_subscriptions.html#payment).

Answer 1

I found the answer in the Developer Content Policy:

◦Developers offering virtual goods or currencies within a game downloaded from Google Play must use Google Play's in-app billing service as the method of payment.

https://play.google.com/about/developer-content-policy.html

Answer 2

Google has recently announced that it now supports PayPal as a payment method. The best part is that if you have implemented in-app purchase you don't have to do anything extra for enabling PayPal support. Details can be found here