> +   @Override
> +   protected String createPayload(Volume.Request.UpdatePayload payload) {
> +
> +      dataCenterId = payload.dataCenterId();
> +      volumeId = payload.id();
> +      
> +      if (payload.name() != null)
> +         requestBuilder.put("name",  payload.name());
> +      
> +      if (payload.size() != null)
> +         requestBuilder.put("size",  payload.size());
> +      
> +      if (payload.bus() != null)
> +         requestBuilder.put("bus",  payload.bus());
> +      
> +      return (new Gson()).toJson(requestBuilder);

Use `Json` here too.

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