fix: 收银台金额和二维码修复-提取payment_url用于二维码和支付链接

backend/internal/api/handlers/payment.go

@@ -141,10 +141,23 @@ func (h *PaymentHandler) CreatePayment(c *gin.Context) {
 
 	tradeID, _ := data["trade_id"].(string)
 	token, _ := data["token"].(string)
+	paymentURL, _ := data["payment_url"].(string)
+
+	var amount float64
+	if v, ok := data["amount"].(float64); ok {
+		amount = v
+	} else if v, ok := data["amount"].(string); ok {
+		amount, _ = strconv.ParseFloat(v, 64)
+	}
 
 	var actualAmount float64
 	if v, ok := data["actual_amount"].(float64); ok {
 		actualAmount = v
+	} else if v, ok := data["actual_amount"].(string); ok {
+		actualAmount, _ = strconv.ParseFloat(v, 64)
+	}
+	if actualAmount == 0 {
+		actualAmount = amount
 	}
 
 	var expiration int64
@@ -170,9 +183,10 @@ func (h *PaymentHandler) CreatePayment(c *gin.Context) {
 	paymentInfo := map[string]interface{}{
 		"trade_id":        tradeID,
 		"order_id":        order.ID,
-		"amount":          data["amount"],
+		"amount":          amount,
 		"actual_amount":   actualAmount,
 		"token":           token,
+		"payment_url":     paymentURL,
 		"expiration_time": remainingSeconds,
 		"trade_type":      tradeType,
 		"channel_id":      channel.ID,