{
    "id": "clientID3",
    "event": "subscribe",
    "success": true,
    "ts": 1609924478533
}

{
    "topic": "notifications",
    "data": {
        "id": 12345, // notification id
        "messageType": "ORDER_FILLED", // ORDER_FILLED
        "title": "Your order has been filled",
        "type": "TRADE",  // TRADE / SYSTEM
        "level": "GENERAL", // GENERAL / IMPORTANT
        "contentSummary": "Your order to buy 1 NEAR/USDC.e has been filled: 0.5/1 at 1.9876.",
        "content": "<p>Your order to buy 1 NEAR/USDC.e has been filled: 0.5/1 at 1.9876.</p>",
        "contentRaw": { // below example is for a ORDER_FILLED content
            "symbol": "PERP_NEAR_USDC",
            "side": "BUY",
            "orderId": 1,
            "executedPrice": 1.9876, 
            "executedQuantity": 0.5,
            "executedTimestamp": 1567382401000 
        }
    },
    "timestamp": 1679021265398
}