feat(config): Add CurrencyIdentifier to configuration

models/config.go

@@ -7,6 +7,7 @@ type Config struct {
 	APIKey                   string `mapstructure:"APIKEY"`
 	EventName                string `mapstructure:"EVENTNAME"`
 	CurrencySymbol           string `mapstructure:"CURRENCYSYMBOL"`
+	CurrencyIdentifier       string `mapstructure:"CURRENCYIDENTIFIER"`
 	CardSubtitle             string `mapstructure:"CARD_SUBTITLE"`
 	CardBarcodeFormat        string `mapstructure:"CARD_BARCODEFORMAT"`
 	CardBarcodePrefix        string `mapstructure:"CARD_BARCODEPREFIX"`