{
      "subscriptionType": "UserDistanceSubscription",
      "clientCorrelator": "0123",
      "callbackReference": "http://my.callback.com/user-distance/some-id",
      "referenceAddress": [
        "acr:10.0.0.3"
      ],
      "monitoredAddress": [
        "acr:10.0.0.1",
        "acr:10.0.0.2"
      ],
      "distance": 100,
      "trackingAccuracy": 10,
      "criteria": "AllWithinDistance",
      "checkImmediate": true
}