WeChat Pay Java Development Tutorial8

Introduction

WeChat Pay is a popular mobile payment service in China, and it is essential for businesses to integrate WeChat Pay into their applications to reach the Chinese market. This tutorial will guide you through the steps of integrating WeChat Pay into a Java application.

Prerequisites
Java 8 or later
Maven or Gradle
A WeChat Pay merchant account

Step 1: Create a WeChat Pay Merchant Account

If you don't have a WeChat Pay merchant account, you can create one by following the instructions on the WeChat Pay website: .

Step 2: Install the WeChat Pay SDK

Add the following dependency to your project's (for Maven) or (for Gradle):


wxpay-sdk
3.0.8

Step 3: Configure the WeChat Pay SDK

Create a new class to configure the WeChat Pay SDK. In this class, you will need to set the following properties:
appId: Your WeChat Pay merchant account's app ID
mchId: Your WeChat Pay merchant account's merchant ID
mchKey: Your WeChat Pay merchant account's merchant key
notifyUrl: The URL where WeChat Pay will send notifications about the payment status

Here is an example configuration class:
public class WeChatPayConfig {
private String appId;
private String mchId;
private String mchKey;
private String notifyUrl;
public WeChatPayConfig() {
// Set the WeChat Pay configuration properties here
}
// Getters and setters for the configuration properties
}

Step 4: Create a Payment Request

To create a payment request, you will need to create a new instance of the UnifiedOrder class and set the following properties:
outTradeNo: A unique ID for the payment request
body: A description of the payment
totalFee: The total amount of the payment, in cents
notifyUrl: The URL where WeChat Pay will send notifications about the payment status
tradeType: The type of payment request, such as "JSAPI" for a JavaScript-based payment

Here is an example payment request:
UnifiedOrder unifiedOrder = new UnifiedOrder();
("123456");
("Test payment");
(100);
("/notify");
("JSAPI");

Step 5: Send the Payment Request

Once you have created the payment request, you can send it to WeChat Pay using the WeChatPay client. The client will return a PrepayId, which is a unique ID that you can use to generate a payment URL.
WeChatPay client = new WeChatPay(WeChatPayConfig);
PrepayId prepayId = (unifiedOrder);

Step 6: Generate a Payment URL

To generate a payment URL, you will need to use the JsApiPay helper class. The helper class will generate a URL that you can use to open the WeChat Pay payment page in a web browser.
JsApiPay jsApiPay = new JsApiPay(WeChatPayConfig);
String paymentUrl = (prepayId);

Step 7: Handle Payment Notifications

When a user completes a payment, WeChat Pay will send a notification to the URL that you specified in the UnifiedOrder request. You can handle this notification by creating a new class that implements the WeChatPayNotificationHandler interface. In this class, you will need to override the processNotification method to handle the payment notification.
@Override
public void processNotification(HttpServletRequest request, HttpServletResponse response) {
// Parse the payment notification and verify the signature
// Update the payment status in your database
}

Conclusion

Integrating WeChat Pay into a Java application is a straightforward process. By following the steps in this tutorial, you can easily add WeChat Pay support to your application and reach the Chinese market.

2024-12-08

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