Ws positions feed selector v1

WSPositionsFeedSelectorV1

Subscribes to a feed of position updates.
Updates get published when a trade is executed, and when leverage configurations are changed for instruments with ongoing positions.
To subscribe to all positions, specify an empty instrument (eg. 2345123).
Otherwise, specify the instrument to only receive positions for that instrument (eg. 2345123-BTC_USDT_Perp).

Name Lite	Type	Required Default	Description
sub_account_id sa	string	True	The subaccount ID to filter by
instrument i	string	False 'all'	The instrument filter to apply.