Implementing OAuth2 with Rauth for vk.com

I'm trying to implement Oauth2 authorization using Rauth for vk.com provider and I have the following issue:

As far as I know there is no way to obtain users email address through vk.com api call, but it sends email address with access_token in json format.

My problem is: I do not know how to obtain it from Rauth's "session" object, there is an access_token field but no way to get an email address.

Here is the code:

def callback(self):
    def decode_json(payload):
        return json.loads(payload.decode('utf-8'))
    if 'code' not in request.args:
        return None, None, None
    oauth_session = self.service.get_auth_session(
        data={'code': request.args['code'],
              'grant_type': 'authorization_code',
              'redirect_uri': self.get_callback_url()},
        decoder=decode_json
    )
    me = oauth_session.get("some call to vk.api").json()

Thank you for your help!

Let me explain. Actually, email is returned by Vkontakte along with access token in case it is provided.

You don't need to use oauth_session.get since it does make a new request, but it is already done, when you got access token. Try to get an object property with oauth_session.email.

P.S. you can find email using get_raw_access_token.