Payments over Google Play |Fast|EASY|ADVANCED|SECURE
Yo! So.. The most of Mobile Phone users are Android Users, right? Also Protonmail does require Google Play to run, right? So why shouldn't we pay our bills ( Plans, extra features like storage etc.. ) with the integrated Google Play Payments? It is fast,easy,advanced and secure. If you wanna Pay with PayPal because you don't have a credit card? No Problem! Pay with Bank or Paypal Funds. Or if you neither have a Bank account ( PayPal as example ) or you want to stay more Anonymous, why shouldn't you pay with Google Play Credit? So you can simply buy Plans and storage.Fast and secure paid instantly! So please think about, to add Google Play Payments.
Isn't it really such a Big deal? Using the Google Play Services API and adding some extra code to receive payments over Google Play and make more income?

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Suggestion commented
The dependence on Google Services Framework is going to be dropped due to....you know... privacy issues related to Google