i’m making an API call: https://api.hubapi.com/contacts/v1/lists/all/contacts/all?hapikey=xxxxxxxx&property=
However i’ve noticed that whenever these properties are null it will not appear in JSON returned, even not as NULL. Why is that? and how can i change it??
Oh and one more thing, how can i make an array of properties i want to retrieve in the URL? is it something like: