code: def refresh_token(self, client_id, client_secret, refresh_token, grant_type='refresh_token'):
          
  
          return self.post(
              'https://{}/oauth/token'.format(self.domain),
              data={
                  'client_id': client_id,
                  'client_secret': client_secret,
                  'refresh_token': refresh_token,
                  'grant_type': grant_type
              },
              headers={'Content-Type': 'application/json'}
          )
docs: Calls oauth/token endpoint with refresh token grant type
  
          Use this endpoint to refresh an access token, using the refresh token you got during authorization.
  
          Args:
              grant_type (str): Denotes the flow you're using. For refresh token
              use refresh_token
  
              client_id (str): your application's client Id
  
              client_secret (str): your application's client Secret
  
              refresh_token (str): The refresh token returned from the initial token request.
  
          Returns:
              access_token, id_token