2021-11-03 8:01:03[1635926463.5422] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 51.4203
    [size] => 16
    [tif] => gtc
)
 Array
(
    [id] => 86093045809
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1635926463.422
    [price] => 51.4203
    [size] => 16
    [refr] => 0
    [left] => 6
    [text] => api
    [fill_price] => 51.4192
    [user] => 621225
    [status] => open
    [is_liq] => 
    [refu] => 0
    [is_close] => 
    [iceberg] => 0
)

2021-11-03 11:01:02[1635937262.7474] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 51.6641
    [size] => 17
    [tif] => gtc
)
 Array
(
    [id] => 86155769292
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1635937262.615
    [price] => 51.6641
    [size] => 17
    [refr] => 0
    [left] => 16
    [text] => api
    [fill_price] => 51.6641
    [user] => 621225
    [status] => open
    [is_liq] => 
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    [is_close] => 
    [iceberg] => 0
)

2021-11-03 13:01:03[1635944463.6428] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 50.1018
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)