@type t() :: %Inttegro.Customer{
  balance: %{optional(String.t()) => Inttegro.CustomerBalanceValue.t()},
  billing_address: Inttegro.CustomerAddress.t() | nil,
  created_at: String.t(),
  custom_data: %{optional(String.t()) => String.t()} | nil,
  email_address: String.t() | nil,
  guest: boolean(),
  id: String.t(),
  name: String.t(),
  phone_number: String.t() | nil,
  reference: String.t() | nil,
  shipping_address: Inttegro.CustomerAddress.t() | nil,
  suffix: String.t() | nil,
  title: String.t() | nil,
  updated_at: String.t() | nil
}