2021-10-11 6:01:03[1633932063.9083] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 34.8758
    [size] => 59
    [tif] => gtc
)
 Array
(
    [id] => 76209495823
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1633932063.769
    [price] => 34.8758
    [size] => 59
    [refr] => 0
    [left] => 56
    [text] => api
    [fill_price] => 34.8758
    [user] => 621225
    [status] => open
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)

2021-10-11 12:01:03[1633953663.8625] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 35.317
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)

2021-10-11 21:01:04[1633986064.4952] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 33.4515
    [size] => 56
    [tif] => gtc
)
 Array
(
    [id] => 76473171035
    [contract] => DOT_USDT
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    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1633986064.36
    [price] => 33.4515
    [size] => 56
    [refr] => 0
    [left] => 56
    [text] => api
    [fill_price] => 0
    [user] => 621225
    [status] => open
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)