title: Android in app billing using external payment processor
body: <p>If I have web and android app that share same data and user can sync between them, but I deicide to charge for "premium" features which can include storing pictures and other stuff which take space on the servers outside android, can I charge for those features (on subscription bases) on the web and unlock them automatically in android while subscription is running without getting banned from the play store?
  Also can I also use some other mobile payment processor, for example paypal to charge for that subscription directly from android app if it will unlock the features on both web and android app? 
  This is what I have found relevant in the developer content policies : </p>
  
  <blockquote>
    <p>In-app purchases: 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. Developers offering
    additional content, services or functionality within another category
    of app downloaded from Google Play must use Google Play's in-app
    billing service as the method of payment, except: where payment is
    primarily for physical goods or services (e.g., buying movie tickets,
    or buying a publication where the price also includes a hard copy
    subscription); <strong>or where payment is for digital content or goods that
    may be consumed outside of the app itself</strong> (e.g., buying songs that can
    be played on other music players). Developers must not mislead users
    about the apps they are selling nor about any in-app services, goods,
    content or functionality they are selling. If your product description
    on Google Play refers to in-app features to which a specific or
    additional charge applies, your description must clearly notify users
    that payment is required to access those features.</p>
  </blockquote>