private async Task <CurrencyRateModel> GetCurrencyRateInternal(string abbreviation, DateTime?onDate = null) { if (!_availableCurrencies.Contains(abbreviation)) { return(null); } return(await _api.GetCurrencyRate(abbreviation, onDate)); }
private async Task <CurrencyRateModel> GetCurrencyRateInternal(string charCode) { return(await _api.GetCurrencyRate(charCode)); }