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fix(payment): use alipay.trade.precreate for PC QR code

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PC branch was calling TradePagePay (alipay.trade.page.pay), which
returns a gateway redirect URL — not a scannable QR payload. That URL
was being written to both PayURL and QRCode, so the frontend's qr_code
branch encoded the URL string into an image. Users scanning it got a
generic HTTP link instead of an Alipay order.

Switch PC to TradePreCreate (FACE_TO_FACE_PAYMENT): returns a native
qr_code string (qr.alipay.com/...) that renders as a real order QR.
Only fill QRCode, leave PayURL empty so the frontend takes the QR
popup branch. Surface empty-qr_code responses with sub_code/sub_msg
for debugging. H5 path (TradeWapPay) unchanged.
This commit is contained in:
erio
2026-04-18 23:15:58 +08:00
parent 5794dc96ef
commit 60bc062b6c
1 changed files with 37 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files
backend/internal/payment/provider/alipay.go
+37 -31
View File
@@ -15,8 +15,8 @@ import (
// Alipay product codes.
const (
alipayProductCodePagePay = "FAST_INSTANT_TRADE_PAY"
alipayProductCodeWapPay = "QUICK_WAP_WAY"
alipayProductCodeWapPay = "QUICK_WAP_WAY"
alipayProductCodeFaceToFace = "FACE_TO_FACE_PAYMENT"
)
// Alipay response constants.
@@ -79,8 +79,12 @@ func (a *Alipay) SupportedTypes() []payment.PaymentType {
return []payment.PaymentType{payment.TypeAlipay}
}
// CreatePayment creates an Alipay payment page URL.
func (a *Alipay) CreatePayment(_ context.Context, req payment.CreatePaymentRequest) (*payment.CreatePaymentResponse, error) {
// 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) {
client, err := a.getClient()
if err != nil {
return nil, err
@@ -96,47 +100,49 @@ func (a *Alipay) CreatePayment(_ context.Context, req payment.CreatePaymentReque
}
if req.IsMobile {
return a.createTrade(client, req, notifyURL, returnURL, true)
return a.createWapTrade(client, req, notifyURL, returnURL)
}
return a.createTrade(client, req, notifyURL, returnURL, false)
return a.createPrecreateTrade(ctx, client, req, notifyURL)
}
func (a *Alipay) createTrade(client *alipay.Client, req payment.CreatePaymentRequest, notifyURL, returnURL string, isMobile bool) (*payment.CreatePaymentResponse, error) {
if isMobile {
param := alipay.TradeWapPay{}
param.OutTradeNo = req.OrderID
param.TotalAmount = req.Amount
param.Subject = req.Subject
param.ProductCode = alipayProductCodeWapPay
param.NotifyURL = notifyURL
param.ReturnURL = returnURL
payURL, err := client.TradeWapPay(param)
if err != nil {
return nil, fmt.Errorf("alipay TradeWapPay: %w", err)
}
return &payment.CreatePaymentResponse{
TradeNo: req.OrderID,
PayURL: payURL.String(),
}, nil
}
param := alipay.TradePagePay{}
func (a *Alipay) createWapTrade(client *alipay.Client, req payment.CreatePaymentRequest, notifyURL, returnURL string) (*payment.CreatePaymentResponse, error) {
param := alipay.TradeWapPay{}
param.OutTradeNo = req.OrderID
param.TotalAmount = req.Amount
param.Subject = req.Subject
param.ProductCode = alipayProductCodePagePay
param.ProductCode = alipayProductCodeWapPay
param.NotifyURL = notifyURL
param.ReturnURL = returnURL
payURL, err := client.TradePagePay(param)
payURL, err := client.TradeWapPay(param)
if err != nil {
return nil, fmt.Errorf("alipay TradePagePay: %w", err)
return nil, fmt.Errorf("alipay TradeWapPay: %w", err)
}
return &payment.CreatePaymentResponse{
TradeNo: req.OrderID,
PayURL: payURL.String(),
QRCode: payURL.String(),
}, nil
}
func (a *Alipay) createPrecreateTrade(ctx context.Context, client *alipay.Client, req payment.CreatePaymentRequest, notifyURL string) (*payment.CreatePaymentResponse, error) {
param := alipay.TradePreCreate{}
param.OutTradeNo = req.OrderID
param.TotalAmount = req.Amount
param.Subject = req.Subject
param.ProductCode = alipayProductCodeFaceToFace
param.NotifyURL = notifyURL
rsp, err := client.TradePreCreate(ctx, 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 &payment.CreatePaymentResponse{
TradeNo: req.OrderID,
QRCode: rsp.QRCode,
}, nil
}