How to use uniapp to develop QR code payment function

How to use uniapp to develop the scan code payment function

With the popularity of mobile payment, scan code payment has become an indispensable part of people's lives. For developers, using uniapp to develop the scan code payment function is a very practical technology. This article will introduce how to use uniapp to develop the scan code payment function and provide code examples.

1. Integrate the scan code payment plug-in

First, we need to integrate the scan code payment plug-in in the uniapp project. Find the payment plug-in suitable for your project in uniapp's plug-in market, such as Alipay payment or WeChat payment. Click to download and complete the plug-in installation.

2. Configure payment parameters

Next, we need to configure payment parameters in the uniapp project. Open the manifest.json file in the project root directory, find the "app-plus" node, and add the following code to it:

"app-plus": {
  "payment": {
    "wechatpay": {
      "appid": "your_appid", 
      "mch_id": "your_mch_id", 
      "apikey": "your_apikey"
    },
    "alipay": {
      "appid": "your_appid", 
      "pid": "your_pid", 
      "rsa2PrivateKey": "your_rsa2PrivateKey"
    }
  }
}

Fill in the corresponding parameters according to your payment method and platform requirements, such as WeChat payment Appid, mch_id and apikey need to be filled in. For Alipay payment, appid, pid and rsa2PrivateKey need to be filled in.

3. Call the scan code payment interface

Now we can start writing code to call the scan code payment interface. Assuming we are using WeChat payment, the following is an example of using uniapp to call WeChat scan code payment:

// 在某个页面的方法中调用扫码支付
async startScanPayment() {
  // 调用uniapp的扫码方法
  uni.scanCode({
    success: res => {
      // 获取扫码结果
      const code = res.result;

      // 调用uni.request发送支付请求
      uni.request({
        url: 'your_payment_api_url',
        method: 'POST',
        data: {
          code: code,
          // 其他支付参数
        },
        success: res => {
          // 处理支付结果
          const paymentResult = res.data;
          // 对支付结果进行处理，并跳转到支付结果页
        },
        fail: err => {
          // 处理支付请求失败的情况
        }
      });
    },
    fail: err => {
      // 处理扫码失败的情况
    }
  });
}

In the above example code, we first call the uni.scanCode method to scan the code and obtain the scanned code. Code results. Then, use the uni.request method to send a payment request to the backend and process the payment results.

4. Processing payment results

According to the actual situation, the payment result can be processed in the callback function of the payment result. For example, you can jump to a page of successful or failed payment based on the payment result.

success: res => {
  const paymentResult = res.data;

  if (paymentResult.success) {
    // 支付成功，跳转到支付成功页面
    uni.navigateTo({
      url: '/pages/paymentSuccess/paymentSuccess'
    });
  } else {
    // 支付失败，跳转到支付失败页面
    uni.navigateTo({
      url: '/pages/paymentFail/paymentFail'
    });
  }
}

On the payment success page and payment failure page, relevant information about the user's payment process can be displayed, and relevant operations and prompts can be provided.

Summary

Through the above steps, we can implement the scan code payment function in uniapp. First, integrate the corresponding payment plug-in and configure payment parameters in the manifest.json file. Then, obtain the payment code by calling the code scanning method and send the payment request to the backend. Finally, the corresponding processing and jump are performed according to the payment results.

I hope this article can help you start using uniapp to develop the scan code payment function. If you have any questions, please leave a message for discussion. Good luck with your development!

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