2021-10-17 16:01:02[1634486462.9722] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 41.282
    [size] => 1
    [tif] => gtc
)
 Array
(
    [id] => 79189764702
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1634486462.851
    [finish_time] => 1634486462.851
    [price] => 41.282
    [size] => 1
    [refr] => 0
    [left] => 0
    [text] => api
    [fill_price] => 41.282
    [user] => 621225
    [finish_as] => filled
    [status] => finished
    [is_liq] => 
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    [is_close] => 
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)

2021-10-17 21:01:04[1634504464.062] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 40.3791
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)