**stpAct** | **string** | Self-Trading Prevention Action. Users can use this field to set self-trade prevetion strategies 1. After users join the `STP Group`, he can pass `stp_act` to limit the user\'s self-trade prevetion strategy. If `stp_act` is not passed, the default is `cn` strategy。 2. When the user does not join the `STP group`, an error will be returned when passing the `stp_act` parameter。 3. If the user did not use \'stp_act\' when placing the order, \'stp_act\' will return \'-\' - cn: Cancel newest, Cancel new orders and keep old ones - co: Cancel oldest, new ones - cb: Cancel both, Both old and new orders will be cancelled | [optional] [default to undefined]
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