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fix(payment): switch PC alipay to redirect-only (trade.page.pay)

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The previous change used TradePreCreate (FACE_TO_FACE_PAYMENT), which
requires the merchant to sign "当面付". Our merchant only has "电脑网站
支付" so Alipay returns ACQ.ACCESS_FORBIDDEN.

Go back to TradePagePay but fix the original bug differently: fill
only PayURL (do NOT fill QRCode). Frontend:
  - PC hits the pay_url branch → openWindow() popup (redirect to
    Alipay's own page, which shows login/QR natively)
  - H5 hits the mobile+pay_url branch → window.location.href jump

This matches Alipay's "电脑网站支付" UX and works with the current
merchant signing scope. No client-side QR encoding of the gateway URL
(which was never a valid scannable payload).
This commit is contained in:
erio
2026-04-18 23:28:21 +08:00
parent 73c87fe3c5
commit 5347fd1eac
1 changed files with 17 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
backend/internal/payment/provider/alipay.go
+17 -19
View File
@@ -15,8 +15,8 @@ import (
// Alipay product codes.
const (
alipayProductCodeWapPay = "QUICK_WAP_WAY"
alipayProductCodeFaceToFace = "FACE_TO_FACE_PAYMENT"
alipayProductCodeWapPay = "QUICK_WAP_WAY"
alipayProductCodePagePay = "FAST_INSTANT_TRADE_PAY"
)
// Alipay response constants.
@@ -79,12 +79,13 @@ func (a *Alipay) SupportedTypes() []payment.PaymentType {
return []payment.PaymentType{payment.TypeAlipay}
}
// CreatePayment creates an Alipay payment:
// - Mobile (H5): alipay.trade.wap.pay, returns a redirect URL the browser jumps to.
// - PC: alipay.trade.precreate (FACE_TO_FACE_PAYMENT), returns a native QR code string
// the frontend renders as an image. Note: TradePagePay would return a gateway
// redirect URL, which cannot be encoded into a scannable QR by the client.
func (a *Alipay) CreatePayment(ctx context.Context, req payment.CreatePaymentRequest) (*payment.CreatePaymentResponse, error) {
// CreatePayment creates an Alipay payment using redirect-only flow:
// - Mobile (H5): alipay.trade.wap.pay — returns a URL the browser jumps to.
// - PC: alipay.trade.page.pay — returns a gateway URL the browser opens in a
// new window; Alipay's own page then shows login/QR. We intentionally do
// NOT encode the URL into a QR on the client (it isn't a scannable payload
// and would produce an invalid scan result).
func (a *Alipay) CreatePayment(_ context.Context, req payment.CreatePaymentRequest) (*payment.CreatePaymentResponse, error) {
client, err := a.getClient()
if err != nil {
return nil, err
@@ -102,7 +103,7 @@ func (a *Alipay) CreatePayment(ctx context.Context, req payment.CreatePaymentReq
if req.IsMobile {
return a.createWapTrade(client, req, notifyURL, returnURL)
}
return a.createPrecreateTrade(ctx, client, req, notifyURL)
return a.createPagePayTrade(client, req, notifyURL, returnURL)
}
func (a *Alipay) createWapTrade(client *alipay.Client, req payment.CreatePaymentRequest, notifyURL, returnURL string) (*payment.CreatePaymentResponse, error) {
@@ -124,25 +125,22 @@ func (a *Alipay) createWapTrade(client *alipay.Client, req payment.CreatePayment
}, nil
}
func (a *Alipay) createPrecreateTrade(ctx context.Context, client *alipay.Client, req payment.CreatePaymentRequest, notifyURL string) (*payment.CreatePaymentResponse, error) {
param := alipay.TradePreCreate{}
func (a *Alipay) createPagePayTrade(client *alipay.Client, req payment.CreatePaymentRequest, notifyURL, returnURL string) (*payment.CreatePaymentResponse, error) {
param := alipay.TradePagePay{}
param.OutTradeNo = req.OrderID
param.TotalAmount = req.Amount
param.Subject = req.Subject
param.ProductCode = alipayProductCodeFaceToFace
param.ProductCode = alipayProductCodePagePay
param.NotifyURL = notifyURL
param.ReturnURL = returnURL
rsp, err := client.TradePreCreate(ctx, param)
payURL, err := client.TradePagePay(param)
if err != nil {
return nil, fmt.Errorf("alipay TradePreCreate: %w", err)
}
if rsp.QRCode == "" {
return nil, fmt.Errorf("alipay TradePreCreate: empty qr_code (code=%s msg=%s sub_code=%s sub_msg=%s)",
rsp.Code, rsp.Msg, rsp.SubCode, rsp.SubMsg)
return nil, fmt.Errorf("alipay TradePagePay: %w", err)
}
return &payment.CreatePaymentResponse{
TradeNo: req.OrderID,
QRCode: rsp.QRCode,
PayURL: payURL.String(),
}, nil
}