@type t() :: %DocuSign.Model.BillingCharge{
  allowedQuantity: String.t() | nil,
  blocked: String.t() | nil,
  chargeName: String.t() | nil,
  chargeType: String.t() | nil,
  chargeUnitOfMeasure: String.t() | nil,
  discounts: [DocuSign.Model.BillingDiscount.t()] | nil,
  firstEffectiveDate: String.t() | nil,
  includedQuantity: String.t() | nil,
  incrementalQuantity: String.t() | nil,
  lastEffectiveDate: String.t() | nil,
  prices: [DocuSign.Model.BillingPrice.t()] | nil,
  unitPrice: String.t() | nil,
  usedQuantity: String.t() | nil
}