2021-12-07 21:01:02[1638910862.3168] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 29.7821
    [size] => -2369
    [tif] => gtc
)
 Array
(
    [label] => INSUFFICIENT_AVAILABLE
    [detail] => margin 8931.669473121875 while available 16.839237144743
)