code: public ApiApp getApiApp(String clientId) throws HelloSignException {
          String url = BASE_URI + API_APP_URI + "/" + clientId;
          return new ApiApp(httpClient.withAuth(auth).get(url).asJson());
      }
docs: Retrieves the API app configuration for the given Client ID.
  
  @param clientId String
  @return ApiApp
  @throws HelloSignException thrown if there's a problem processing the
  HTTP request or the JSON response.