code: def get(self, user_id, client_id, type, fields=None, include_fields=True):
          
  
          params = {
              'fields': fields and ','.join(fields) or None,
              'include_fields': str(include_fields).lower(),
              'user_id': user_id,
              'client_id': client_id,
              'type': type,
          }
          return self.client.get(self._url(), params=params)
docs: List device credentials.
  
          Args:
              user_id (str): The user_id of the devices to retrieve.
  
              client_id (str): The client_id of the devices to retrieve.
  
              type (str): The type of credentials (public_key, refresh_token).
  
              fields (list, optional): A list of fields to include or exclude
                  (depending on include_fields) from the result, empty to
                  retrieve all fields
  
              include_fields (bool, optional): True if the fields specified are
                  to be included in the result, False otherwise
                  (defaults to true)
  
  
          See: https://auth0.com/docs/api/management/v2#!/Device_Credentials/get_device_credentials