2021-11-15 16:01:02[1636992062.8957] - new sell order: Array
(
    [contract] => DOT_USDT
    [price] => 45.8193
    [size] => -6
    [tif] => gtc
)
 Array
(
    [id] => 93310825132
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1636992062.77
    [price] => 45.8193
    [size] => -6
    [refr] => 0
    [left] => -3
    [text] => api
    [fill_price] => 45.8208
    [user] => 621225
    [status] => open
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)

2021-11-15 21:01:03[1637010063.2283] - new sell order: Array
(
    [contract] => DOT_USDT
    [price] => 44.8772
    [size] => -0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)