2021-10-10 7:01:03[1633849263.5616] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 36.7672
    [size] => 64
    [tif] => gtc
)
 Array
(
    [id] => 75830522259
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1633849263.424
    [price] => 36.7672
    [size] => 64
    [refr] => 0
    [left] => 61
    [text] => api
    [fill_price] => 36.7672
    [user] => 621225
    [status] => open
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)

2021-10-10 22:01:02[1633903262.8863] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 34.6955
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)