WeChat applet payment java

php editor Banana introduces you to the WeChat mini program payment Java development tutorial. WeChat Mini Program Payment is a sub-service of WeChat Pay, which can implement payment functions in Mini Programs and provide users with a convenient shopping experience. This tutorial will teach you how to use Java language to develop WeChat mini program payment, including steps such as accessing the WeChat payment interface, generating prepayment orders, and processing payment results. By studying this tutorial, you will be able to easily implement the payment function of WeChat mini program, adding more practicality and convenience to your mini program.

WeChat Mini Program Payment Java Implementation

WeChatmini programPayment provides a convenient payment mechanism, allowing developers to easily integrate payment functions into their mini programs. The following are the steps to implement WeChat applet payment using Java language:

1. Environment preparation

• Register WeChat applet and obtain AppID and AppSecret
• Introducing WeChat Mini Program Payment SDK
• Configure WeChat payment merchant information

2. Order generation

Order generation is the first step in the WeChat applet payment process. You need to initiate a unified order request to WeChat Pay to generate a prepayment order. The Java code is as follows:

// Unified order placement
UnifiedOrder unifiedOrder = new UnifiedOrder();
unifiedOrder.setAppId(appId);
unifiedOrder.setMchId(mchId);
unifiedOrder.setNonceStr(nonceStr);
unifiedOrder.setBody(body);
unifiedOrder.setOutTradeNo(outTradeNo);
unifiedOrder.setTotalFee(totalFee);
unifiedOrder.setSpbillCreateIp(spbillCreateIp);
unifiedOrder.setNotifyUrl(notifyUrl);
unifiedOrder.setTradeType(tradeType);

String response = UnifiedOrder.requestUnifiedorder(unifiedOrder);

In the above code, the meaning of each parameter is as follows:

• appId: Mini Program AppID
• mchId: merchant number
• nonceStr: Random string
• body: product description
• outTradeNo: merchant order number
• totalFee: order amount, unit is cent
• spbillCreateIp: The IP address that initiated the payment request
• notifyUrl: payment result callback URL
• tradeType: payment type, such as jsapi

3. WeChat signature

After generating a prepayment order, the order data needs to be signed to ensure data security. The Java code is as follows:

// WeChat signature
SortedMap<String, String> signMap = new TreeMap<>();
signMap.put("appId", appId);
signMap.put("nonceStr", nonceStr);
signMap.put("package", "prepay_id=" prepayId);
signMap.put("signType", signType);
signMap.put("timeStamp", timeStamp);

String sign = Sign.createSign(signMap, partnerKey);

In the above code, the meaning of each parameter is as follows:

• prepayId: Prepayment order ID
• partnerKey: merchant key

4. Payment

Send the signed data to the mini programFront-end, and the front-end completes the payment by calling the WeChat payment interface. The Java code is as follows:

// Return payment information to the mini program
Map<String, Object> info = new HashMap<>();
info.put("appId", appId);
info.put("nonceStr", nonceStr);
info.put("package", "prepay_id=" prepayId);
info.put("signType", signType);
info.put("timeStamp", timeStamp);
info.put("paySign", sign);

return info;

5. Payment callback

After the user completes the payment, WeChat Pay will initiate a POST request to the callback URL. Developers need to verify the legitimacy of the request and update the order status.

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