code: public Map<String, Object> send(GetItemValues request) throws ApiException {
          String responseStr = sendRequest(request);
  
          TypeReference<HashMap<String,Object>> typeRef 
                  = new TypeReference<HashMap<String,Object>>() {};
          try {
              return this.mapper.readValue(responseStr, typeRef);
          } catch (IOException e) {
              e.printStackTrace();
          }
          return null;
      }
docs: /* End of the generated code