2021-10-28 7:01:08[1635404468.0211] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 41.2194
    [size] => 1
    [tif] => gtc
)
 Array
(
    [id] => 83131127379
    [contract] => DOT_USDT
    [mkfr] => 0
    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1635404467.886
    [finish_time] => 1635404467.886
    [price] => 41.2194
    [size] => 1
    [refr] => 0
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    [text] => api
    [fill_price] => 41.2107
    [user] => 621225
    [finish_as] => filled
    [status] => finished
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)

2021-10-28 10:01:03[1635415263.9975] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 42.9983
    [size] => -1
    [tif] => gtc
)
 Array
(
    [id] => 83186500350
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    [tkfr] => 0.0005
    [tif] => gtc
    [is_reduce_only] => 
    [create_time] => 1635415263.861
    [price] => 42.9983
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    [user] => 621225
    [status] => open
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)

2021-10-28 21:01:02[1635454862.6452] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 42.4936
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)