f

app/main/api/internal/service/alipayService.go

@@ -144,17 +144,21 @@ func (a *AliPayService) CreateAlipayOrder(ctx context.Context, amount float64, s
 }
 
 // AliRefund 发起支付宝退款。orderPayTime 为订单支付时间（或创建时间）；仅当落在 [2026-01-25 16:38:17, 2026-02-02 18:26) 区间内时使用 bak 商户号，否则使用正式商户号；传 nil 则使用正式商户号。
-func (a *AliPayService) AliRefund(ctx context.Context, outTradeNo string, refundAmount float64, orderPayTime *time.Time) (*alipay.TradeRefundRsp, error) {
+// outRequestNo 为商户退款请求号，同一笔退款需唯一；传空则使用 "refund-"+outTradeNo，重试时建议传入唯一号避免支付宝报重复。
+func (a *AliPayService) AliRefund(ctx context.Context, outTradeNo string, refundAmount float64, orderPayTime *time.Time, outRequestNo string) (*alipay.TradeRefundRsp, error) {
 	client := a.AlipayClient
 	if orderPayTime != nil && a.AlipayClientBak != nil &&
 		!orderPayTime.Before(AlipayBakRefundStart) && orderPayTime.Before(AlipayBakRefundEnd) {
 		client = a.AlipayClientBak
 	}
 
+	if outRequestNo == "" {
+		outRequestNo = fmt.Sprintf("refund-%s", outTradeNo)
+	}
 	refund := alipay.TradeRefund{
 		OutTradeNo:   outTradeNo,
 		RefundAmount: lzUtils.ToAlipayAmount(refundAmount),
-		OutRequestNo: fmt.Sprintf("refund-%s", outTradeNo),
+		OutRequestNo: outRequestNo,
 	}
 
 	refundResp, err := client.TradeRefund(ctx, refund)