@type t() :: %DocuSign.Model.DowngradePlanUpdateResponse{
  accountPaymentMethod: String.t() | nil,
  discountApplied: String.t() | nil,
  downgradeEffectiveDate: String.t() | nil,
  downgradePaymentCycle: String.t() | nil,
  downgradePlanId: String.t() | nil,
  downgradePlanName: String.t() | nil,
  downgradeRequestStatus: String.t() | nil,
  message: String.t() | nil,
  productId: String.t() | nil,
  promoCode: String.t() | nil,
  saleDiscount: String.t() | nil,
  saleDiscountPeriods: String.t() | nil,
  saleDiscountType: String.t() | nil
}