2021-11-28 6:01:03[1638079263.9104] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 33.2258
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)

2021-11-28 13:01:03[1638104463.353] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 33.6244
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)

2021-11-28 22:01:02[1638136862.3055] - new buy order: Array
(
    [contract] => DOT_USDT
    [price] => 35.043
    [size] => 0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)