如何使用Go语言开发点餐系统的支付宝接口集成功能

go get GitHub.com/inouttt/alipay.v2

import (
    "github.com/inouttt/alipay.v2"
)

func main() {
    alipayClient := alipay.NewClient(appId, privateKey, publicKey, false)
    alipayClient.SetNotifyUrl(notifyUrl)
    alipayClient.Redirect(HttpWriter, httpReq, subject, outTradeNo, totalAmount)
}

func requestPayment(orderId string, totalAmount float64) *alipay.TradeAppPayResponse {
    param := &alipay.TradeAppPayRequestParam{
        Subject:     "点餐系统订单",
        OutTradeNo:  orderId,
        TotalAmount: utils.FORMatFloat(totalAmount),
        ProductCode: "QUICK_MSECURITY_PAY",
    }
    resp, err := alipayClient.TradeAppPay(param)
    if err != nil {
        log.Println("请求支付宝支付失败:", err)
        return nil
    }
    return resp
}

func handlePaymentNotify(callbackReq *http.Request) (*alipay.NotifyResponse, error) {
    notifyReq, err := alipayClient.GetTradeNotification(callbackReq)
    if err != nil {
        return nil, err
    }
    isSuccess := notifyReq.IsTradeSuccess()
    if isSuccess {
        orderId := notifyReq.OutTradeNo
        // 更新订单状态为已支付
        updateOrderPaymentStatus(orderId)
    }
    // 返回给支付宝处理结果
    notifyResp := alipayClient.GetTradeNotificationResponse(true)
    return notifyResp, nil
}