How to use Go language to develop the payment management function of the ordering system

How to use Go language to develop the payment management function of the ordering system

With the popularity of mobile payment, the ordering system has become an indispensable part of the catering industry . In order to improve user experience and efficiency, many restaurants have begun to use ordering systems, and developers are constantly looking for better technical solutions to meet changing needs. This article will introduce how to use Go language to develop the payment management function of the ordering system and give corresponding code examples.

1. Design the payment management function

Before designing the payment management function, we must clarify the payment methods that the ordering system needs to support. Generally speaking, the ordering system needs to support the following payment methods:

1. Online payment: Users can make online payments through mobile phones or computers, including Alipay, WeChat Pay, UnionPay, etc.
2. Offline payment: Users can choose offline payment methods, such as cash payment, card payment, etc.

Now we can start designing the payment management function. First, we need to define a payment structure to store payment-related information:

type Payment struct {
    ID          string      // 支付ID
    UserID      string      // 用户ID
    OrderID     string      // 订单ID
    Amount      float64     // 支付金额
    Status      string      // 支付状态
    PayMethod   string      // 支付方式
    PayTime     time.Time   // 支付时间
}

The fields in the payment structure can be expanded or modified according to specific needs. Next, we can define some functions to implement payment management functions:

1. Create payment order function

func CreatePayment(userID string, orderID string, amount float64, payMethod string) (*Payment, error) {
    paymentID := generatePaymentID() // 生成支付ID
    payTime := time.Now()   // 获取当前时间

    // 根据参数创建支付结构体对象
    payment := &Payment{
        ID:          paymentID,
        UserID:      userID,
        OrderID:     orderID,
        Amount:      amount,
        Status:      "unpaid",
        PayMethod:   payMethod,
        PayTime:     payTime,
    }

    // 具体的支付方式处理逻辑，比如生成二维码或者跳转支付页面等
    switch payMethod {
    case "alipay":
        generateAlipayQRCode(payment)  // 生成支付宝二维码
    case "wechatpay":
        generateWechatpayQRCode(payment)  // 生成微信支付二维码
    case "unionpay":
        generateUnionpayQRCode(payment)  // 生成银联支付二维码
    }

    // 保存支付信息到数据库中

    return payment, nil
}

In creating payment order function, we first generate a unique Payment ID, and then create a payment structure object based on the parameters. Then, depending on the payment method, the corresponding function is called to implement specific payment processing logic, such as generating a payment QR code. Finally, save the payment information to the database.

2. Payment callback function

The payment callback function is used to receive notification of payment results. When the user completes the payment, payment platforms such as Alipay and WeChat will send a POST request with the payment result to the callback URL we provided. We need to parse the request and process the payment result according to the payment platform's protocol.

func PayResultCallback(c *gin.Context) {
    paymentID := c.PostForm("payment_id")     // 获取支付ID
    paymentStatus := c.PostForm("payment_status")  // 获取支付状态

    // 根据支付ID，从数据库中获取支付订单信息
    payment, err := getPaymentByID(paymentID)
    if err != nil {
        // 处理错误情况
    }

    // 更新支付状态
    payment.Status = paymentStatus

    // 执行相应的业务逻辑，如修改订单状态、发送通知等

    // 保存支付订单信息到数据库

    // 返回响应给支付平台
    c.String(http.StatusOK, "success")
}

In the payment callback function, we obtain the payment ID and payment status from the POST request, and then obtain the payment order information from the database based on the payment ID. Next, the corresponding business logic is executed based on the payment results, such as modifying the order status, sending notifications, etc. Finally, the updated payment order information is saved to the database and a response is returned to the payment platform.

2. Implement the payment management function

Before implementing the payment management function, we need to introduce the corresponding dependency packages, such as gin for building web applications, and the corresponding database driver package, etc. You can use the go mod command to manage dependent packages:

go mod init 
go get github.com/gin-gonic/gin
go get github.com/go-sql-driver/mysql

Then, we can create a Go file, define related functions and structures, and implement payment management functions. The specific code implementation is complex and beyond the scope of this article.

3. Test the payment management function

After implementing the payment management function, we need to write corresponding test cases to verify the correctness of the function. You can use Go's testing package to write test cases to ensure the quality of the code. Here is a simple test case example:

func TestCreatePayment(t *testing.T) {
    payment, _ := CreatePayment("user_001", "order_001", 100.00, "alipay")
    if payment == nil {
        t.Errorf("CreatePayment() failed, expected payment is not nil")
    }
}

In the test case, we call the CreatePayment function to create a payment order and check whether the returned payment object is nil. If not nil, the test passes.

Summary:

This article introduces how to use Go language to develop the payment management function of the ordering system, and gives corresponding code examples. By designing the payment structure and corresponding functions, the creation of payment orders and the processing of payment result callbacks can be realized. Before implementing and testing functions, you need to introduce the corresponding dependency packages and use Go's testing package to write test cases. Through these steps, we can ensure the correctness and stability of the payment management function and improve the user experience and efficiency of the ordering system.

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