2021-12-06 12:01:03[1638792063.497] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 26.2489
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)

2021-12-06 21:01:03[1638824463.9173] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 27.0524
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)