credentials() :: %{user: String.t(), password: String.t(), endpoint: String.t()}

t() :: %{
  hotel_code: String.t(),
  rate_amount_messages: [
    %{
      status_application_control: %{
        start: String.t(),
        end: String.t(),
        rate_plan_code: String.t(),
        inv_type_code: String.t()
      },
      rates: [
        %{
          base_by_guest_amts: [
            %{
              currency_code: String.t(),
              amount_after_tax: integer(),
              number_of_guests: integer(),
              age_qualifying_code: integer()
            }
          ]
        }
      ]
    }
  ]
}