docs: @Override
      public Map<String, List<String>> toParameters() {
          final Map<String, List<String>> outParams = new LinkedHashMap<>();
          outParams.put("resource", Collections.singletonList(resource));
          outParams.put("grant_type", Collections.singletonList(GRANT_TYPE) );
          outParams.put("code", Collections.singletonList(deviceCode.getDeviceCode()));
  
          return outParams;
      }