@type t() :: %DocuSign.Model.UserSignatureDefinition{
  dateStampProperties: DocuSign.Model.DateStampProperties.t() | nil,
  disallowUserResizeStamp: String.t() | nil,
  externalID: String.t() | nil,
  imageType: String.t() | nil,
  isDefault: String.t() | nil,
  nrdsId: String.t() | nil,
  nrdsLastName: String.t() | nil,
  phoneticName: String.t() | nil,
  signatureFont: String.t() | nil,
  signatureId: String.t() | nil,
  signatureInitials: String.t() | nil,
  signatureName: String.t() | nil,
  signatureType: String.t() | nil,
  stampFormat: String.t() | nil,
  stampSizeMM: String.t() | nil
}