Using Rest API from in Xojo App for OS X?

I have a iPad App, which using . That works perfect.

Now I want to access some data and change some data with a OS X app creating by Xojo.
There is just a Objective-C framework from, no one for Xojo. But they have a REST API.

Does anyone of you used the Rest Api in Xojo before?

How do you save an object in with Xojo?
How do you load an object in with Xojo?

Are there best practices ways?

I use Xojo httpsecuresocket w/ JSON RPC to integrate Xojo w/ RESTful APIs.