diff --git a/app/main/api/internal/logic/pay/paymentlogic.go b/app/main/api/internal/logic/pay/paymentlogic.go
index 24ed7ab..28548b9 100644
--- a/app/main/api/internal/logic/pay/paymentlogic.go
+++ b/app/main/api/internal/logic/pay/paymentlogic.go
@@ -7,6 +7,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"strings"
 	"time"
 	"tyc-server/app/main/api/internal/svc"
 	"tyc-server/app/main/api/internal/types"
@@ -35,6 +36,21 @@ type PaymentTypeResp struct {
 	payMerchantID string
 }
 
+// prepayDataMissing 判断第三方支付预创建是否未返回可用参数（含 interface 包了一层 nil 的情况）
+func prepayDataMissing(v interface{}) bool {
+	if v == nil {
+		return true
+	}
+	switch t := v.(type) {
+	case string:
+		return t == ""
+	case map[string]string:
+		return len(t) == 0
+	default:
+		return false
+	}
+}
+
 func NewPaymentLogic(ctx context.Context, svcCtx *svc.ServiceContext) *PaymentLogic {
 	return &PaymentLogic{
 		Logger: logx.WithContext(ctx),
@@ -44,6 +60,10 @@ func NewPaymentLogic(ctx context.Context, svcCtx *svc.ServiceContext) *PaymentLo
 }
 
 func (l *PaymentLogic) Payment(req *types.PaymentReq) (resp *types.PaymentResp, err error) {
+	req.PayMethod = strings.TrimSpace(req.PayMethod)
+	req.PayType = strings.TrimSpace(req.PayType)
+	req.Id = strings.TrimSpace(req.Id)
+
 	var paymentTypeResp *PaymentTypeResp
 	var prepayData interface{}
 	l.svcCtx.OrderModel.Trans(l.ctx, func(ctx context.Context, session sqlx.Session) error {
@@ -90,6 +110,21 @@ func (l *PaymentLogic) Payment(req *types.PaymentReq) (resp *types.PaymentResp,
 		if createOrderErr != nil {
 			return errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "生成订单, 创建支付订单失败: %+v", createOrderErr)
 		}
+		// 在事务内校验并失败则回滚，避免订单已落库却无 prepay（此前仅事务外校验会产生脏订单）
+		if req.PayMethod == "wechat" || req.PayMethod == "alipay" {
+			if prepayDataMissing(prepayData) {
+				platformVal := l.ctx.Value("platform")
+				logx.WithContext(l.ctx).Errorf(
+					"[Payment] 事务内 prepay 为空将回滚: pay_method=%q pay_type=%q order_no=%s platform=%v prepayData_type=%T",
+					req.PayMethod, req.PayType, paymentTypeResp.outTradeNo, platformVal, prepayData,
+				)
+				return errors.Wrapf(
+					xerr.NewErrCodeMsg(xerr.SERVER_COMMON_ERROR, "获取支付参数失败，请确认在微信内打开且已完成网页授权后重试"),
+					"创建支付失败: prepay 为空 platform=%v",
+					platformVal,
+				)
+			}
+		}
 		return nil
 	})
 	if err != nil {
@@ -97,8 +132,13 @@ func (l *PaymentLogic) Payment(req *types.PaymentReq) (resp *types.PaymentResp,
 	}
 
 	if req.PayMethod == "wechat" || req.PayMethod == "alipay" {
-		if prepayData == nil {
-			return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "创建支付失败: 未生成支付参数")
+		if prepayDataMissing(prepayData) {
+			logx.WithContext(l.ctx).Errorf("[Payment] 事务提交后 prepay 仍为空(不应出现): pay_method=%q id=%q platform=%v",
+				req.PayMethod, req.Id, l.ctx.Value("platform"))
+			return nil, errors.Wrapf(
+				xerr.NewErrCodeMsg(xerr.SERVER_COMMON_ERROR, "获取支付参数失败，请稍后重试"),
+				"创建支付失败: 未生成支付参数",
+			)
 		}
 	}
 
diff --git a/app/main/api/internal/middleware/global_sourceinterceptor_middleware.go b/app/main/api/internal/middleware/global_sourceinterceptor_middleware.go
index c7197b3..f2974ab 100644
--- a/app/main/api/internal/middleware/global_sourceinterceptor_middleware.go
+++ b/app/main/api/internal/middleware/global_sourceinterceptor_middleware.go
@@ -3,6 +3,7 @@ package middleware
 import (
 	"context"
 	"net/http"
+	"strings"
 )
 
 const (
@@ -12,7 +13,7 @@ const (
 func GlobalSourceInterceptor(next http.HandlerFunc) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		// 获取请求头 X-Platform 的值
-		platform := r.Header.Get(PlatformKey)
+		platform := strings.TrimSpace(r.Header.Get(PlatformKey))
 
 		// 将值放入新的 context 中
 		ctx := r.Context()
diff --git a/app/main/api/internal/service/wechatpayService.go b/app/main/api/internal/service/wechatpayService.go
index 935e969..3c5b2d3 100644
--- a/app/main/api/internal/service/wechatpayService.go
+++ b/app/main/api/internal/service/wechatpayService.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 	"strconv"
+	"strings"
 	"time"
 	"tyc-server/app/main/api/internal/config"
 	"tyc-server/app/main/model"
@@ -273,10 +274,14 @@ func (w *WechatPayService) CreateWechatH5Order(ctx context.Context, amount float
 func (w *WechatPayService) CreateWechatOrder(ctx context.Context, amount float64, description string, outTradeNo string) (interface{}, error) {
 	platformVal := ctx.Value("platform")
 	platform, ok := platformVal.(string)
+	platform = strings.TrimSpace(platform)
 	if !ok || platform == "" {
+		logx.WithContext(ctx).Errorf("[WechatPay] CreateWechatOrder 缺少 X-Platform")
 		return "", fmt.Errorf("缺少 X-Platform 请求头（微信内请传 wxh5）")
 	}
 
+	logx.WithContext(ctx).Infof("[WechatPay] CreateWechatOrder platform=%q out_trade_no=%s", platform, outTradeNo)
+
 	var prepayData interface{}
 	var err error
 
@@ -319,6 +324,10 @@ func (w *WechatPayService) CreateWechatOrder(ctx context.Context, amount float64
 		return "", fmt.Errorf("支付订单创建失败: %v", err)
 	}
 
+	if prepayData == nil {
+		logx.WithContext(ctx).Errorf("[WechatPay] CreateWechatOrder 返回 prepayData 为 nil platform=%q", platform)
+	}
+
 	// 返回预支付ID
 	return prepayData, nil
 }