code: public PropertiesEnvelope deleteUserProperties(String userId, String aid) throws ApiException {
          ApiResponse<PropertiesEnvelope> resp = deleteUserPropertiesWithHttpInfo(userId, aid);
          return resp.getData();
      }
docs: Delete User Application Properties
  Deletes a user&#39;s application properties
  @param userId User Id (required)
  @param aid Application ID (optional)
  @return PropertiesEnvelope
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body