LastMessage

{
    "message_server_id": 0,
    "message_client_id": "string",
    "sender_id": "string",
    "conversation_type": 0,
    "receiver_id": "string",
    "team_id": 0,
    "message_type": 0,
    "sub_type": 0,
    "create_time": 0,
    "text": "string",
    "attachment": {},
    "extension": "string",
    "sender_client_type": 0
}