How uniapp implements Alipay payment function

With the rapid development of mobile Internet, people are increasingly relying on mobile payments. Alipay is one of the most widely used payment methods. In mobile applications, if you want to develop Alipay payment functions, then using the uniapp framework is a very good choice. This article will introduce how uniapp implements the Alipay payment function.

1. Preparation work

Before starting to implement Alipay payment, we need to complete some preparation work:

1. Obtain an Alipay open platform account

First You need to register an account on the Alipay Open Platform. For details, you can go to the Alipay Open Platform to register.

2. Create an application

After registering an Alipay open platform account, you need to create an application. After creating an application, you can obtain the AppId of the application, which is one of the necessary parameters for Alipay payment.

3. Obtain Alipay SDK

Download Alipay SDK and import it into the uniapp project.

2. Alipay payment core code

1. Introducing Alipay JsSDK

   <script src="path/to/alipayjsapi.js"></script>

2. Parameter information that needs to be paid

   {
    partner: '',//商户id
    seller_id: '',//卖家id
    out_trade_no: '',//商户订单号
    subject: '',//订单名称
    body: '',//订单详情
    total_fee: '',//商品金额
    notify_url: '',//回调地址
    service: 'mobile.securitypay.pay',
    payment_type: '1',
    _input_charset: 'utf-8',
    timestamp: '',//时间戳
    app_id: '',//支付宝应用id
    sign_type: 'RSA',
    sign: ''
   }

The most important parameter is sign, which is the signed string. The signature method is completed through the RSA algorithm.

3. Call Alipay payment

   //调起支付宝支付
   function callAlipay(orderInfo) {
    Alipay.pay({
        orderStr: orderInfo //支付请求参数字符串
    }, function(result) {
        //支付成功回调函数
        uni.showToast({
            title: '支付成功',
            icon: 'success'
        });
    }, function(error) {
        //支付失败回调函数
        uni.showToast({
            title: '支付失败'
        });
    });
   }

3. Alipay payment process description

1. The user chooses to use Alipay payment within the application .

2. The application passes the order information to the server, and the server generates a signature based on the order information.

3. The application passes the order information containing the signature to the front end.

4. The front end calls Alipay JsSDK for payment.

5. The Alipay client displays the payment page, and the user enters the password to complete the payment.

6. After the payment is successful, the Alipay client calls back the callback address set by the application and notifies the application of the payment result.

7. The application updates the order status based on the callback information.

4. Summary

This article introduces how to use uniapp to implement the Alipay payment function. In the specific implementation, you need to pay attention to the following points:

1. You need to first obtain an Alipay open platform account and create an application.

2. Alipay SDK needs to be imported.

3. The signature method is RSA algorithm.

4. The process of interacting with Alipay involves communication between the front end, the server and Alipay.

Through the above methods, we can easily implement the Alipay payment function of uniapp, providing a wealth of choices for mobile application payment methods.

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