t() :: %SwedbankpayCheckout.Model.Payer{
  birth_year: String.t() | nil,
  device:
    SwedbankpayCheckout.Model.Device.t()
    | SwedbankpayCheckout.Model.LoadableUrl.t(),
  email: String.t(),
  gender: String.t() | nil,
  id: String.t(),
  msisdn: String.t(),
  name: String.t() | nil,
  reference: String.t(),
  shipping_address:
    SwedbankpayCheckout.Model.ShippingAddress.t()
    | SwedbankpayCheckout.Model.LoadableUrl.t()
}