gistfile1.py

    def save_bearer_token(self, token, request, *args, **kwargs):
        if request.old_token:
            request.old_token.delete()

        scopes = request.scopes

        if type(scopes) is str:
            scopes = request.scopes.split()

        BearerToken(
            client=request.client.key,
            scopes=scopes,
            user=request.user,
            access_token=token['access_token'],
            refresh_token=token['refresh_token'],
            expires_at=datetime.datetime.now() + datetime.timedelta(hours=1)
        ).put()

        return request.client.default_redirect_uri