use Mix.Config config :ex_money, exchange_rate_service: true, open_exchange_rates_app_id: {:system, "OPEN_EXCHANGE_RATES_APP_ID"}, exchange_rates_retrieve_every: 300_000, callback_module: Money.ExchangeRates.Callback, log_failure: :warn, log_info: :info, log_success: :info config :ex_cldr, locales: ["en", "root"]