@type t() :: %IbkrApi.ClientPortal.Order.OrderPreviewRequest{
  acct_id: String.t() | nil,
  allocation_method: String.t() | nil,
  aux_price: float() | nil,
  c_oid: String.t() | nil,
  cash_qty: float() | nil,
  conid: integer() | nil,
  conidex: String.t() | nil,
  fx_qty: float() | nil,
  is_ccy_conv: boolean() | nil,
  is_single_group: boolean() | nil,
  listing_exchange: String.t() | nil,
  order_type: String.t() | nil,
  outside_rth: boolean() | nil,
  parent_id: String.t() | nil,
  price: float() | nil,
  quantity: integer() | nil,
  referrer: String.t() | nil,
  sec_type: String.t() | nil,
  side: String.t() | nil,
  strategy: String.t() | nil,
  strategy_parameters: map(),
  ticker: String.t() | nil,
  tif: String.t() | nil,
  trailing_amt: float() | nil,
  trailing_type: String.t() | nil,
  use_adaptive: boolean() | nil
}