BroadcastMessageBatch

{
    "has_more": true,
    "next_token": "string",
    "items": {
        "broadcast_id": "string",
        "from_account_id": "string",
        "content": "string",
        "offline_enabled": true,
        "target_os": [
            "string"
        ],
        "create_time": 0,
        "expire_time": 0
    }
}