@type t() :: %Stripe.Params.ShippingRateCreateParams{
  delivery_estimate:
    Stripe.Params.ShippingRateCreateParams.DeliveryEstimate.t() | nil,
  display_name: String.t(),
  expand: [String.t()] | nil,
  fixed_amount: Stripe.Params.ShippingRateCreateParams.FixedAmount.t() | nil,
  metadata: %{required(String.t()) => String.t()} | nil,
  tax_behavior: String.t() | nil,
  tax_code: String.t() | nil,
  type: String.t() | nil
}