"Mappings": {
    "default": "default",
    "66499587": "killzone"
  },​

...where killzone is the name of a RuleSet.

"Mappings": {
"default": "default",
"raid-pvp": "raid",
"air-pvp": "raid",
"arena-pvp": "raid",
"petrol-pvp": "raid",

my id in zone manager are "raid-pvp" etc.....

      "name": "killall",
      "enabled": true,
      "defaultAllowDamage": true,
      "flags": "HumanNPCDamage, LockedBoxesImmortal, LockedDoorsImmortal, AdminsHurtSleepers",
      "rules": [
        "anything can hurt dispensers",
        "anything can hurt players",
        "players can hurt players",
        "anything can hurt traps",
        "traps can hurt players",
        "players can hurt barricades",
        "barricades can hurt players",
        "highwalls can hurt players",
        "anything can hurt heli",
        "anything can hurt npcs",
        "fire cannot hurt players",
        "anything can hurt resources",
        "players can hurt npcs"
      ]
​

    {
      "Name": "killzone1",
      "Radius": 20.0,
      "Radiation": 0.0,
      "Comfort": 0.0,
      "Temperature": 0.0,
      "Location": "1383.454 67.28368 731.0082",
      "Size": "0 0 0",
      "Rotation": "0 0 0",
      "Id": "66499587",
      "EnterMessage": "Entering PvP Zone1!",
      "LeaveMessage": "Leaving PvP Zone1!",
      "Permission": null,
      "EjectSpawns": null,
      "Enabled": true,
      "Flags": "None"
    }
​

        private List<string> GetLocationKeys(BaseEntity entity)
        {
            if(!useZones || entity == null) return null;
            List<string> locations = new List<string>();
            if (ZoneManager != null)
            {
                List<string> zmloc = new List<string>();
				if (entity is BasePlayer)
				{
                    string[] zmlocplr = (string[]) ZoneManager.Call("GetPlayerZoneIDs", new object[] { entity as BasePlayer });
                    foreach(string str in zmlocplr)
                    {
                        zmloc.Add(str);
                    }
				}
				else
				{
					string[] zmlocent = (string[]) ZoneManager.Call("GetEntityZoneIDs", new object[] { entity });
                    foreach(string s in zmlocent)
                    {
                        zmloc.Add(s);
                    }
				}

                if (zmloc != null && zmloc.Count > 0)
                {
                    locations.AddRange(zmloc);
                }
            }
            if (LiteZones != null)
            {
                List<string> lzloc = (List<string>) LiteZones?.Call("GetEntityZones", new object[] { entity });
                if (lzloc != null && lzloc.Count > 0)
                {
                    locations.AddRange(lzloc);
                }
            }
            if (locations == null || locations.Count == 0) return null;
            return locations;
        }​

This is probably not the best way to do it, but for me it is working.