2022-01-04 19:01:03[1641322863.4789] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 28.9169
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)

2022-01-04 21:01:03[1641330063.8992] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 29.3736
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)