docs: def get_access_token(self, code):
          """ Gets the access token for the app given the code
  
              Parameters:
                  - code - the response code
          """
  
          payload = {'redirect_uri': self.redirect_uri,
                     'code': code,
                     'grant_type': 'authorization_code'}
  
          headers = self._make_authorization_headers()
  
          response = requests.post(self.OAUTH_TOKEN_URL, data=payload,
              headers=headers, verify=LOGIN_VERIFY_SSL_CERT)
          if response.status_code is not 200:
              raise MercedesMeAuthError(response.reason)
          token_info = response.json()
          token_info = self._add_custom_values_to_token_info(token_info)
          self._save_token_info(token_info)
          return token_info