code: public boolean deleteApiApp(String clientId) throws HelloSignException {
          String url = BASE_URI + API_APP_URI + "/" + clientId;
          return HttpURLConnection.HTTP_NO_CONTENT == httpClient.withAuth(auth).delete(url).asHttpCode();
      }
docs: Attempts to delete the API app with the given client ID.
  
  @param clientId String The Client ID of the app that should be deleted.
  @return boolean true if the API app was successfully deleted
  @throws HelloSignException thrown if there's a problem processing the
  HTTP request or the JSON response.