[AJAX]JSON - jak przejsc to drzewko? Opcje

[--Artur--]

Pobieram takiego JSON:

[XML] pobierz, plaintext 
  "HotelName": "Roomex Test Hotel Do Not Book ",
  "Contracts": [
    {
      "ContractName": "BAR",
      "ContractCode": "bar",
      "CurrencyCode": "EUR",
      "RoomTypes": [
        {
          "RoomTypeName": "Twin",
          "RoomTypeCode": "TWN"
        },
        {
          "RoomTypeName": "Double",
          "RoomTypeCode": "DBL"
        }
      ],
      "MealOptions": [
        {
          "MealOptionName": "Room Only",
          "MealOptionCode": 14,
          "MealOptionPrice": 0
        },
        {
          "MealOptionName": "Full Breakfast",
          "MealOptionCode": 11,
          "MealOptionPrice": 10
        }
      ]
    },
    {
      "ContractName": "Dinner",
      "ContractCode": "dinner",
      "CurrencyCode": "EUR",
      "RoomTypes": [
        {
          "RoomTypeName": "Double",
          "RoomTypeCode": "DBL"
        },
        {
          "RoomTypeName": "Twin",
          "RoomTypeCode": "TWN"
        }
      ],
      "MealOptions": [
        {
          "MealOptionName": "Full Breakfast",
          "MealOptionCode": 11,
          "MealOptionPrice": 0
        }
      ]
    }
  ]
}
[XML] pobierz, plaintext 

Chciałbym wypisać wszytskie ContractCode , probowalem tak:

[PHP] pobierz, plaintext 
function getHotelInfo(yourAPIKey){
 var enquiry = "http://api.roomex.com/api/hotel?apiKey=" + yourAPIKey;
 //alert(enquiry);
 $.ajax({
 
        url: enquiry,
        type: 'GET',
        dataType: "jsonp",
        jsonp: "callback",
        jsonpCallback: "jsonpCallback2",
        complete: function (response, responseCode) {
            console.log(response); console.log(responseCode);
            //alert("complete");           
        },
        success: function (json) {
            $.each(json, function(index,value){
                alert(this.Contracts.ContractCode);
            });
        }
    });
}
[PHP] pobierz, plaintext 

ale wyswietal undefined.
jak do teog podejsc?