Message

{
    "messageId": 123456,
    "chatsKey": "private_user001_user123456",
    "senderId": "user_123456",
    "messageType": "text",
    "messageContent": {
        "text": "Hello World"
    },
    "messageExtra": {
        "mentions": [
            "user_123456"
        ],
        "metadata": {}
    },
    "sendTime": "2023-10-17T12:00:00Z",
    "messageStatus": "sent",
    "replyToMessageId": 123456
}