2021-12-06 0:01:03[1638748863.6789] - new sell order: Array
(
    [contract] => DOT_USDT
    [price] => 28.3194
    [size] => -0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)

2021-12-06 11:01:03[1638788463.5751] - new sell order: Array
(
    [contract] => DOT_USDT
    [price] => 25.409
    [size] => -0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)

2021-12-06 14:01:03[1638799263.4647] - new sell order: Array
(
    [contract] => DOT_USDT
    [price] => 26.2656
    [size] => -0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)