code: public static Map.Entry<String, Map<String, ?>> sendSMSCommand(
              String phoneNumber, String message) {
          ImmutableMap<String, ?> parameters = ImmutableMap
                  .<String, Object>builder().put("phoneNumber", phoneNumber)
                  .put("message", message)
                  .build();
  
          return new AbstractMap.SimpleEntry<>(SEND_SMS, parameters);
      }
docs: This method forms a {@link Map} of parameters for the element
  value replacement. It is used against input elements
  
  @param phoneNumber The phone number of message sender
  @param message The message content
  
  @return a key-value pair. The key is the command name. The value is a {@link Map} command arguments.