docs: def auth_oauth2(self) -> dict:
          """
          Authorizes a user by OAuth2 to get access token
          """
          oauth_data = {
              'client_id': self._app_id,
              'display': 'mobile',
              'response_type': 'token',
              'scope': '+66560',
              'v': self.API_VERSION
          }
          response = self.post(self.OAUTH_URL, oauth_data)
          url_params = get_url_params(response.url, fragment=True)
          if 'access_token' in url_params:
              return url_params
  
          action_url = get_base_url(response.text)
          if action_url:
              response = self.get(action_url)
              return get_url_params(response.url)
  
          response_json = response.json()
          if 'error' in response_json['error']:
              exception_msg = '{}: {}'.format(response_json['error'],
                                              response_json['error_description'])
              raise VVKAuthException(exception_msg)