{
  "messageId": "unique-message-identifier",
  "senderId": "sender-identifier",
  "feed": "feed-identifier",
  "channel": "channel-name",
  "subject": "Message headline or title",
  "subtitle": "Supporting headline with additional context",
  "body": "Full text content of the message...",
  "assets": [
    {
      "type": "media-type",
      "assetUrl": "https://example.com/path/to/asset"
    }
  ],
  "ts": 1234567890000000,
  "activity": "activity-classification",
  "sentiment": "sentiment-value",
  "geolocation": {
    "lat": 0.000000,
    "lng": 0.000000,
    "lastUpdate": 0
  },
  "activityIcon": "/path/to/icon.png"
}