2021-10-21 5:01:03[1634792463.253] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 43.9957
    [size] => 30
    [tif] => gtc
)
 Array
(
    [id] => 80563645700
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1634792463.111
    [finish_time] => 1634792463.111
    [price] => 43.9957
    [size] => 30
    [refr] => 0
    [left] => 0
    [text] => api
    [fill_price] => 43.9923
    [user] => 621225
    [finish_as] => filled
    [status] => finished
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)

2021-10-21 13:01:04[1634821264.232] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 43.8752
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)