GET
The GET method allows you to retrieve a list of members based on their permission and type of role
 
GET projecten.viadesk.com/api/roles.json?
    id=111756-746f646f // id of the item
    &permission=read // which kind of permission (read, addChildren, write, delete).
 
This returns an array of users that have the requested role or permission:
 
[
   {
     "name": "Patty Baard",
     "id": "6200-75736572",
     "thumbnailUrl": "projecten.viadesk.com/thumbnail/119025-7573657.png"   
    }
]