2021-10-09 13:01:04[1633784464.3948] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 34.6469
    [size] => 78
    [tif] => gtc
)
 Array
(
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2021-10-09 15:01:03[1633791663.656] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 35.4428
    [size] => -3
    [tif] => gtc
)
 Array
(
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    [is_reduce_only] => 
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    [price] => 35.4428
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2021-10-09 19:01:02[1633806062.1261] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 36.484
    [size] => 73
    [tif] => gtc
)
 Array
(
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    [price] => 36.484
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