@type t() :: %DocuSign.Model.BillingPlan{
  appStoreProducts: [DocuSign.Model.AppStoreProduct.t()] | nil,
  currencyPlanPrices: [DocuSign.Model.CurrencyPlanPrice.t()] | nil,
  enableSupport: String.t() | nil,
  includedSeats: String.t() | nil,
  otherDiscountPercent: String.t() | nil,
  paymentCycle: String.t() | nil,
  paymentMethod: String.t() | nil,
  perSeatPrice: String.t() | nil,
  planClassification: String.t() | nil,
  planFeatureSets: [DocuSign.Model.FeatureSet.t()] | nil,
  planId: String.t() | nil,
  planName: String.t() | nil,
  seatDiscounts: [DocuSign.Model.SeatDiscount.t()] | nil,
  supportIncidentFee: String.t() | nil,
  supportPlanFee: String.t() | nil
}