result.json

{
    "id": "trk_Txyy1vaM",
    "object": "Tracker",
    "mode": "test",
    "tracking_code": "EZ4000000004",
    "status": "delivered",
    "created_at": "2014-11-18T10:51:54Z",
    "updated_at": "2014-11-19T10:51:54Z",
    "signed_by": "John Tester",
    "weight": 17.6,
    "est_delivery_date": "2014-11-27T00:00:00Z",
    "shipment_id": null,
    "carrier": "UPS",
    "tracking_details": [
      {
        "object": "TrackingDetail",
        "message": "BILLING INFORMATION RECEIVED",
        "status": "pre_transit",
        "datetime": "2014-11-21T14:24:00Z",
        "tracking_location": {
          "object": "TrackingLocation",
          "city": null,
          "state": null,
          "country": null,
          "zip": null
        }
      }
    ]
  }