t() :: %ExDeltaExchange.Product{
  annualized_funding: String.t(),
  basis_factor_max_limit: String.t(),
  contract_type: String.t(),
  contract_unit_currency: String.t(),
  contract_value: String.t(),
  created_at: String.t(),
  default_leverage: String.t(),
  description: String.t(),
  funding_method: String.t(),
  id: non_neg_integer(),
  impact_size: 0,
  initial_margin: 0,
  initial_margin_scaling_factor: String.t(),
  is_quanto: boolean(),
  liquidation_penalty_factor: String.t(),
  maintenance_margin: String.t(),
  maintenance_margin_scaling_factor: String.t(),
  maker_commission_rate: String.t(),
  max_leverage_notional: String.t(),
  notional_type: String.t(),
  position_size_limit: non_neg_integer(),
  price_band: String.t(),
  product_specs: map(),
  quoting_asset: ExDeltaExchange.Product.Asset.t(),
  settlement_time: String.t(),
  settling_asset: ExDeltaExchange.Product.Asset.t() | nil,
  spot_index: map(),
  state: String.t(),
  symbol: String.t(),
  taker_commission_rate: String.t(),
  tick_size: String.t(),
  trading_status: String.t(),
  underlying_asset: ExDeltaExchange.Product.Asset.t(),
  updated_at: String.t()
}