{
          "header":
          {
            "expiration":"2011-10-11T23:59:59.9999999",
            "messageType":"User",
            "senderXuid":"123456789",
            "sender":"Striker",
            "sent":"2011-05-08T17:30:00Z",
            "hasAudio":false,
            "hasPhoto":false,
            "hasText":true
          },
        "messageText":"random user text up to 256 characters"
        }