diff --git a/internal/logic/public/portal/purchaseCheckoutLogic.go b/internal/logic/public/portal/purchaseCheckoutLogic.go
index 2775547..9e0ea2d 100644
--- a/internal/logic/public/portal/purchaseCheckoutLogic.go
+++ b/internal/logic/public/portal/purchaseCheckoutLogic.go
@@ -423,17 +423,19 @@ func (l *PurchaseCheckoutLogic) queryExchangeRate(to string, src int64) (amount
 	}{}
 	tool.SystemConfigSliceReflectToStruct(currency, &configs)
 
-	// Skip conversion if no exchange rate API key configured
-	if configs.AccessKey == "" {
+	l.Infow("queryExchangeRate", logger.Field("to", to), logger.Field("unit", configs.CurrencyUnit), logger.Field("hasAccessKey", strings.TrimSpace(configs.AccessKey) != ""))
+
+	if strings.TrimSpace(configs.AccessKey) == "" {
+		l.Infof("[PurchaseCheckout] AccessKey is empty, skip conversion")
 		return amount, nil
 	}
 
-	// Convert currency if system currency differs from target currency
-	if configs.CurrencyUnit != to {
-		result, err := exchangeRate.GetExchangeRete(configs.CurrencyUnit, to, configs.AccessKey, 1)
+	if strings.TrimSpace(configs.CurrencyUnit) != strings.TrimSpace(to) {
+		result, err := exchangeRate.GetExchangeRete(configs.CurrencyUnit, to, strings.TrimSpace(configs.AccessKey), 1)
 		if err != nil {
 			return 0, err
 		}
+		l.Infow("exchangeRate", logger.Field("from", configs.CurrencyUnit), logger.Field("to", to), logger.Field("rate", result))
 		amount = result * amount
 	}
 	return amount, nil