2021-11-02 15:01:03[1635865263.6282] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 51.0719
    [size] => 18
    [tif] => gtc
)
 Array
(
    [id] => 85697642042
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1635865263.489
    [price] => 51.0719
    [size] => 18
    [refr] => 0
    [left] => 15
    [text] => api
    [fill_price] => 51.0719
    [user] => 621225
    [status] => open
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)

2021-11-02 17:01:03[1635872463.6908] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 51.2307
    [size] => 16
    [tif] => gtc
)
 Array
(
    [id] => 85742032514
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1635872463.555
    [price] => 51.2307
    [size] => 16
    [refr] => 0
    [left] => 14
    [text] => api
    [fill_price] => 51.2197
    [user] => 621225
    [status] => open
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)

2021-11-02 19:01:03[1635879663.9629] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 51.7399
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)

2021-11-02 21:01:02[1635886862.6731] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 51.3244
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)