@type t() :: %DocuSign.Model.CustomField{
  customFieldType: String.t() | nil,
  errorDetails: DocuSign.Model.ErrorDetails.t() | nil,
  fieldId: String.t() | nil,
  listItems: [String.t()] | nil,
  name: String.t() | nil,
  required: String.t() | nil,
  show: String.t() | nil,
  value: String.t() | nil
}