How to use Golang to implement JD payment for web applications

With the rapid development of e-commerce, more and more companies are beginning to choose online payment to complete the transaction process. Among them, JD Pay, as one of the well-known three-party payment service providers in China, is favored by enterprises and consumers. As Golang is an efficient and concise programming language, more and more companies are beginning to consider using it to develop web applications. This article will introduce how to use Golang to implement JD payment for web applications.

1. Register Jingdong Payment Developer Account
   First, you need to go to the Jingdong Payment website to register a developer account. After the registration is completed, log in to the console and select "Access Management" - "Merchant Management" - "Merchant Configuration Information" to obtain the merchant number, merchant key and other information.
2. Create Golang project
   Next, create a Golang project on your local computer. You can use any integrated development environment (IDE), such as Visual Studio Code. Open the terminal and use the following command to create a new Golang application:

$ go mod init example.com/myproject

Among them, example.com/myproject can be replaced with the project name and path you want. After execution, a go.mod file will be generated for managing project dependencies.

3. Install Golang third-party packages
   In order to implement the JD payment function, you need to install some necessary Golang third-party packages. Use the following command in the terminal:

$ go get github.com/smartwalle/alipay/v3

This package is the Alibaba Cloud Alipay SDK developed using Golang and can be used to implement JD.com’s payment function. After the installation is complete, import the package into the project:

import "github.com/smartwalle/alipay/v3"

4. Configuring JD payment parameters
   To implement JD payment function in Golang, you need to set some necessary parameters, such as merchant number and merchant key , Alipay public key, etc. Add the following content to the code:

alipayClient := alipay.NewClient("商户号", "密钥")
// 设置公钥
alipayClient.SetAliPayPublicKey("支付宝公钥")
// 设置签名类型
alipayClient.SetSignType(alipay.RSA2)

Among them, the "merchant number" and "key" can be obtained in the JD payment console, and the "Alipay public key" also needs to be downloaded in the console. In addition, you also need to set the signature type. JD Pay supports three signature methods: MD5, RSA, and RSA2. It is recommended to use RSA2 signature.

5. Execute payment
   Now you can use Golang to implement JD.com’s payment function. The following is a simple example to automatically jump to the JD.com payment page for payment when the user submits an order:

func MakePayment(orderNo string, amount float64) (string, error) {
    var p = alipay.TradePagePay{}
    p.NotifyURL = "http://xxx.com/notify"
    p.ReturnURL = "http://xxx.com/return"
    p.Subject = "订单名称"
    p.Body = "订单描述"
    p.OutTradeNo = orderNo
    p.ProductCode = "FAST_INSTANT_TRADE_PAY"
    p.TotalAmount = amount

    url, err := alipayClient.TradePagePay(p)
    if err != nil {
        return "", err
    }

    return url.String(), nil
}

where orderNo is the order number and amount is the order amount. NotifyURL and ReturnURL are the payment result notification URL and the return URL after payment is completed respectively. Subject and Body represent the order name and order description. OutTradeNo is the only order number on the merchant's website and needs to ensure the uniqueness of each payment. ProductCode is Alipay’s preset product code.

6. Verify payment result
   After completing the payment, you need to verify whether the payment result is correct. The JD payment server will send a payment result notification to NotifyURL, and relevant logic can be written in the code for processing. The following is an example:

func VerifyPayment(notification *alipay.TradeNotification) error {
    var err = alipayClient.VerifySign(notification)
    if err != nil {
        return err
    }

    if notification.TradeStatus != "TRADE_SUCCESS" {
        return errors.New("支付失败")
    }

    return nil
}

Among them, the VerifySign function is used to verify whether the signature of the payment result is correct. If an error is returned, the payment result is incorrect. You can determine whether the payment was successful based on the TradeStatus field.

Conclusion:
This article introduces how to use Golang to implement the JD payment function of web applications, including registering a developer account, creating a Golang project, installing third-party packages, configuring payment parameters, implementing payment functions and verification Pay the results. If you are interested in Golang and payment functions, you can continue to learn more.

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