code: public String callServiceConfiguration(boolean pretty)
      {
          try
          {
              // Call Authlete's /api/service/configuration API.
              return mApi.getServiceConfiguration(pretty);
          }
          catch (AuthleteApiException e)
          {
              // The API call failed.
              throw apiFailure("/api/service/configuration", e);
          }
      }
docs: Call Authlete's {@code /api/service/configuration} API.