@type t() :: %Inttegro.Refund{
  canceled_at: String.t() | nil,
  created_at: String.t(),
  custom_data: %{optional(String.t()) => String.t()} | nil,
  failed_at: String.t() | nil,
  id: String.t(),
  line_items: [Inttegro.RefundLineItem.t()],
  order_id: String.t(),
  processing_at: String.t() | nil,
  reason: Inttegro.RefundReason.t(),
  reason_details: String.t() | nil,
  reference: String.t() | nil,
  status: Inttegro.RefundStatus.t(),
  succeeded_at: String.t() | nil,
  total: Inttegro.Amount.t()
}