Update: {
    channel: "level3";
    data: [{
        asks: {
            event: "add" | "modify" | "delete";
            limit_price: number;
            order_id: string;
            order_qty: number;
            timestamp: string;
        }[];
        bids: {
            event: "add" | "modify" | "delete";
            limit_price: number;
            order_id: string;
            order_qty: number;
            timestamp: string;
        }[];
        checksum: number;
        symbol: string;
    }];
    type: "snapshot" | "update";
}

Reference: Orders (Level 3)