How to use golang payment

Go language is a compiled, concurrent, and garbage collection programming language. It has the advantages of simplicity, speed, and security. Therefore, it has been favored by more and more developers and enterprises in recent years. It is a very common requirement to implement payment functions in Go language applications, and this article will briefly introduce how to use Go language to implement payment functions.

1. Choose a payment channel

Before implementing the payment function, the first step you must do is to choose a reliable payment channel. Currently, the market provides numerous payment channels, such as Alipay, WeChat Pay, UnionPay Pay, etc. This article will take Alipay as an example to briefly introduce how to use Go language to implement payment functions.

2. Open an Alipay developer account

Before using Alipay to pay, you need to open a developer account on the Alipay official website and select the corresponding access method as needed. I won’t go into details here, readers can refer to Alipay development documents by themselves.

3. Install Alipay SDK

Alipay SDK is an officially provided toolkit that can help us implement Alipay payment functions. In Go language, you can use the following command to install the development package:

go get -u github.com/smartwalle/alipay/v3

Among them, "smartwalle/alipay/v3" is an open source Go language Alipay SDK, which provides all the functions required for Alipay payment.

4. Create Alipay client

Before making Alipay payment, you need to create an Alipay client first. The code is as follows:

import (
    "github.com/smartwalle/alipay/v3"
    "github.com/smartwalle/alipay/v3/constant"
)

func NewAlipayClient(appID, privateKey, publicKey string) *alipay.Client {
    client := alipay.New(appID, privateKey, false)
    client.SetSignType(constant.RSA2)
    client.SetPublicKey(publicKey)
    return client
}

Among them, appID, privateKey and publicKey are Obtained from Alipay Developer Backend.

5. Initiate payment

After creating the Alipay client, you can initiate a payment request. Taking the creation of Alipay payment QR code as an example, the sample code is as follows:

import (
    "github.com/smartwalle/alipay/v3"
    "github.com/smartwalle/alipay/v3/constant"
    "github.com/smartwalle/alipay/v3/requests"
    "github.com/smartwalle/alipay/v3/sign"
)

func BuildAlipayQROrder(client *alipay.Client, subject, outTradeNo, totalAmount, notifyURL string) (string, error) {
    p := requests.TradePrecreate{
        Subject:     subject,
        OutTradeNo:  outTradeNo,
        TotalAmount: totalAmount,
        NotifyURL:   notifyURL,
    }

    signType := client.GetSignType()
    if signType == constant.RSA || signType == constant.RSA2 {
        b, err := sign.AliPayURLValues(p)
        if err != nil {
            return "", err
        }
        p.Sign = sign.SignWithPKCS1v15(string(b), client.PrivateKey, signType)
    }

    resp, err := client.TradePrecreate(p)
    if err != nil {
        return "", err
    }

    if resp.Content.Code == "10000" {
        return resp.Content.QRCode, nil
    } else {
        return "", fmt.Errorf("[%s] %s", resp.Content.Code, resp.Content.Msg)
    }
}

Here the TradePrecreate interface is encapsulated into the BuildAlipayQROrder method. Among them, subject is the product name, outTradeNo is the merchant order number, totalAmount is the order amount, notifyURL is the payment result notification address, and QRCode is the generated Alipay scan payment QR code.

6. Processing payment results

When the user completes the payment, Alipay will asynchronously notify the merchant of the payment result, which needs to be processed in a timely manner during development. The code example is as follows:

import (
    "github.com/smartwalle/alipay/v3"
    "github.com/smartwalle/alipay/v3/constant"
    "github.com/smartwalle/alipay/v3/requests"
)

// 处理支付宝异步通知
func HandleAlipayNotify(client *alipay.Client, params alipay.NotifyParams) error {
    b, err := json.Marshal(params)
    if err != nil {
        return err
    }

    if err := client.CheckNotifySign(string(b)); err != nil {
        return err
    }

    switch params.TradeStatus {
    case "TRADE_SUCCESS":
        tradeQuery, err := client.TradeQuery(requests.TradeQuery{
            OutTradeNo: params.OutTradeNo,
            TradeNo:    params.TradeNo,
        })
        if err != nil {
            return err
        }

        if tradeQuery.Content.TradeStatus == "TRADE_SUCCESS" {
            // 订单处理成功，执行自己的业务逻辑
        }
    case "TRADE_CLOSED":
        // 订单已关闭，执行自己的业务逻辑
    default:
        return fmt.Errorf("unsupported trade status: %s", params.TradeStatus)
    }

    return nil

}

According to the parameters of Alipay asynchronous notification, you can query the order payment status by calling the TradeQuery interface, and finally execute your own business logic based on the actual payment results.

7. Summary

This article introduces how to use Go language to implement Alipay payment function. First, you need to open an Alipay developer account and select the corresponding access method. Then, by installing Alipay SDK, creating an Alipay client, initiating payment requests and processing payment results, a simple Alipay payment function was finally realized. In actual applications, further adjustments may be required according to your own needs.

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