@type t() :: %Stripe.Params.SubscriptionScheduleUpdateParams.Phases.AddInvoiceItems{
  discounts:
    [
      Stripe.Params.SubscriptionScheduleUpdateParams.Phases.AddInvoiceItems.Discounts.t()
    ]
    | nil,
  metadata: %{required(String.t()) => String.t()} | nil,
  period:
    Stripe.Params.SubscriptionScheduleUpdateParams.Phases.AddInvoiceItems.Period.t()
    | nil,
  price: String.t() | nil,
  price_data:
    Stripe.Params.SubscriptionScheduleUpdateParams.Phases.AddInvoiceItems.PriceData.t()
    | nil,
  quantity: integer() | nil,
  tax_rates: map() | nil
}