@Goran
By default, all valued properties will be included. If you include the “property” parameter, then the returned data will only include the property or properties that you request.
Here is a link to the docs on how to implement that.
@Goran
There isn’t a way to break it down to something as simple as your example there. You will receive the general structure on the contact. You will have to parse the JSON for the value that you want. The only thing you can cut down is the amount of properties you receive with in the properties object.
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Once you have your hapikey try and make the call again replacing demo with your key.