title: OAuth for anonymous users
body: <p>Lets say that we have an app (web/mobile/desktop) on witch the user never logins/registers but we still want to give him access to some resources, for example doing a <code>POST /v1/users</code> for example.</p>
  
  <p>In order to do that POST the client needs an <code>access_token</code>. How does OAuth should work here? Or other authentication mechanism should be used?</p>