@type t() :: %ExOanda.PositionSide{
  average_price: float() | nil,
  commission: float() | nil,
  dividend_adjustment: float() | nil,
  financing: float() | nil,
  guaranteed_execution_fees: float() | nil,
  pl: float() | nil,
  resettable_pl: float() | nil,
  trade_ids: [String.t()] | nil,
  units: integer() | nil,
  unrealized_pl: float() | nil
}