{
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  "data": {
    "version": 2,
    "type": "trackingEvent",
    "payload": [
      {"type": "progress", "offset": 0.0, "urls": ["https://beacons.example.com/c/1aa1d7e5/progress-0"]},
      {"type": "progress", "offset": 7.5075, "urls": ["https://beacons.example.com/c/1aa1d7e5/progress-1"]},
      {"type": "progress", "offset": 15.015, "urls": ["https://beacons.example.com/c/1aa1d7e5/progress-2"]},
      {"type": "progress", "offset": 22.5225, "urls": ["https://beacons.example.com/c/1aa1d7e5/progress-3"]}
    ]
  }
}