Filled trade notification

When a new trade is filled after subscription to Websocket filled trades, the server will automatically push it to the client, and this message does not require a reply.

Name	Type	Description
trade_id	string	Trade id
maker_user_id	string	Maker's user id
taker_user_id	string	Taker's user id
maker_user_name	string	Maker's user name
taker_user_name	string	Taker's user name
currency	string	BTC / ETH
quantity	float	For single leg, quantity of the leg; For multileg, quantity of the combo.
direction	string	Taker's direction: buy/sell
price	float	Option value for single leg, net option value for multilegs (taking selling Bull Spread as an example, the meaning of bidding this price is the difference between the leg 1 sell atm call say 0.0500, and leg 2 buy otm call say 0.0100, net = -0.0500+0.0100 = -0.0400. Taker bid a minus price thus net collecting premiums. Maker ask a minus price thus net paying premiums.).
mark_price	float	mark price of combo
kind	string	Kind:option/future/spot
combo_type	string	Combo Type
ref_index_price	float	Index price at the time of transaction
ref_inquiry_id	string	Associated inquiry id
ref_quote_id	string	Associated quote id
create_at	datetime	Order filling time (UTC)
summary_greeks	json	summary greeks of taker,maker needs to be negated
legs.instrument	string	Contract name
legs.size	float	For single leg, legs.size is 1. For multilegs, legs.size is the quantity of other legs divided by the quantity of smallest leg (if the quantities of leg1 and leg2 are 50 and 30, then legs.size of leg1 is 1.667, legs.size of leg2 is 1).
legs.price	float	Unit price of each contract
legs.direction	string	The direction of single legs: buy/sell
legs.mark_price	float	Mark price
legs.bid_price	float	Screen bid price
legs.ask_price	float	Screen ask price

// push message
{
    "id" : 1,
    "jsonrpc" : 2.0,
    "method" : "subscription",
    "params" : {
        "channel":"trade.BTC",
        "data":{
            "trade_id":"xxxxxxxxxxx",
            "maker_user_id":"1231231",
            "taker_user_id":"4563452",
            "maker_user_name":"COOK",
            "taker_user_name":"Ryan",
            "currency":"BTC",
            "quantity":25,
            "direction":"buy",
            "price":0.0031,
            "ref_index_price":24012.2,
            "ref_inquiry_id":"aaaaaaa",
            "ref_quote_id":"bbbbbbb",
            "create_at":"2023-08-19 12:00:00",
            "summary_greeks":{
                "delta":12.2,
                "gamma":-0.01201,
                "vega":132,
                "theta":23
            },
            "legs":[
                {
                    "instrument":"BTC-25NOV22-19000-P",
                    "size":1,
                    "price":0.0031,
                    "direction":"buy",
                    "mark_price":0.003,
                    "bid_price":0.0025,
                    "ask_price":0.0035
                }
            ]
        }
    }
}