Retrieve user positions. To retrieve subaccount positions, use subaccount_id parameter.
Scope: trade:read
Currency name or "any" if don't care
BTC, ETH, USDC, USDT, EURR, any "BTC"
Kind filter on positions
Instrument kind: "future", "option", "spot", "future_combo", "option_combo"
future, option, spot, future_combo, option_combo "future"
The user id for the subaccount