@type t() :: %Rapyd.Types.SavedPaymentMethod{
  category: String.t() | nil,
  created_at: integer(),
  expiration_month: String.t() | nil,
  expiration_year: String.t() | nil,
  fields: [map()],
  id: String.t(),
  is_default: boolean(),
  last4: String.t() | nil,
  metadata: map() | nil,
  network_type: String.t() | nil,
  type: String.t()
}