java WeChat applet payment

php Xiaobian Yuzai will introduce you to Java WeChat applet payment in detail. With the popularity of mobile payment, Java WeChat applet payment has become a popular choice for merchants to provide online payment services. Through payment through the WeChat applet developed in Java, merchants can accept payment requests from users conveniently and quickly, providing users with a more convenient shopping experience. This article will help you understand the relevant knowledge and operation methods of Java WeChat applet payment, allowing you to easily build your own payment system.

Java WeChat Mini Program Payment

Preface

WeChatmini programPayment is a convenient and fast payment method that allows users to pay directly in the WeChat mini program. The WeChat Mini Program Payment Library (WePay SDK) is provided for Java developers, which contains all necessary api and functions, thereby simplifying the integration of the payment process.

Integration steps

1. Add dependencies

Add the following dependencies in the pom.xml file of the project:

<dependency>
<groupId>com.GitHub.wxpay</groupId>
<artifactId>wxpay-sdk</artifactId>
<version>4.0.2</version>
</dependency>

2. Create WePay object

Create a WePay object to access the WeChat applet payment API:

WePay wePay = new WePay.Builder()
.appId(appId)
.partnerId(partnerId)
.partnerKey(partnerKey)
.notifyUrl(notifyUrl)
.build();

3. Generate payment request object

Use wePay object to generate payment request object:

PayRequest payRequest = new PayRequest()
.setBody(body)
.setOutTradeNo(outTradeNo)
.setTotalFee(totalFee)
.setSpbillCreateIp(spbillCreateIp)
.setTradeType(TradeType.jsAPI);

4. Send payment request

Send the payment request object to the WeChat applet payment API:

PayResponse payResponse = wePay.createOrder(payRequest);

5. Get mini program payment parameters

Get the mini program payment parameters from the payment response:

Map<String, String> payParams = payResponse.getPayParams();

6. Front-end calls WeChat applet payment SDK

In the mini program Front end Call the WeChat mini program payment SDK and pass in the payment parameters:

wx.requestPayment({
timeStamp: payParams.timeStamp,
nonceStr: payParams.nonceStr,
package: payParams.package,
signType: payParams.signType,
paySign: payParams.paySign,
success: function(res) {},
fail: function(res) {}
});

7. Backend payment result notification

After the WeChat applet payment is successful, WeChat will send a payment result notification to the backend :

@PostMapping("/notify")
public String notify(@RequestBody PayNotifyRequest payNotifyRequest) {
if (wePay.isSignatureValid(payNotifyRequest)) {
// Process payment results
}
return "SUCCESS";
}

Advanced Features

Refund

• Create a refund request object: RefundRequest refundRequest = new RefundRequest()
• Send refund request: RefundResponse refundResponse = wePay.refund(refundRequest)

checking order

• Create a query order request object: OrderQueryRequest orderQueryRequest = new OrderQueryRequest()
• Send query order request: OrderQueryResponse orderQueryResponse = wePay.queryOrder(orderQueryRequest)

Close order

• Create a close order request object: CloseOrderRequest closeOrderRequest = new CloseOrderRequest()
• Send a close order request: CloseOrderResponse closeOrderResponse = wePay.closeOrder(closeOrderRequest)

Best Practices

• Ensure the security and confidentiality of payment parameters.
• When processing payment result notifications, verify signatures to prevent fraud.
• Record all payment transactions for future inquiry.
• Adjust the timeout of the payment callback URL as needed.

in conclusion

Java WeChat Mini Program Payment is a simple and easy-to-use function that allows developers to integrate payment functions into WeChat Mini Programs. By following the steps in this article, developers can easily implement mini program payments and meet users' payment needs.

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