UserGroupLink

{
    "id": "FID001",
    "type": "UserGroupLink",
    "attributes": {
        "message": "string",
        "public": true,
        "requiresCode": true
    },
    "relationships": {
        "userGroup": {
            "data": {
                "id": "FID001",
                "type": "UserGroup"
            }
        },
        "subPortal": {
            "data": {
                "id": "FID001",
                "type": "SubPortal"
            }
        }
    }
}