2021-10-15 5:01:02[1634274062.569] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 40.5327
    [size] => 14
    [tif] => gtc
)
 Array
(
    [id] => 78015284285
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1634274062.434
    [price] => 40.5327
    [size] => 14
    [refr] => 0
    [left] => 14
    [text] => api
    [fill_price] => 0
    [user] => 621225
    [status] => open
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)

2021-10-15 8:01:03[1634284863.3536] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 40.8617
    [size] => 38
    [tif] => gtc
)
 Array
(
    [id] => 78078170750
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1634284863.242
    [price] => 40.8617
    [size] => 38
    [refr] => 0
    [left] => 38
    [text] => api
    [fill_price] => 0
    [user] => 621225
    [status] => open
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)

2021-10-15 17:01:03[1634317263.7615] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 40.5574
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)