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WeChat Pay Drop-in integration

Add WeChat Pay to an existing iOS Drop-in integration.

Our iOS Drop-in renders WeChat Pay in your payment form, and triggers the app switch from your app to the WeChat app on the shopper's device.

Before you begin

This page explains how to add WeChat Pay to your existing iOS Drop-in integration. The iOS Drop-in integration works the same way for all payment methods. If you haven't done this integration yet, refer to our Drop-in integration guide.

Before starting your WeChat Pay integration, you need to:

  1. Make sure that you have set up your back end implementation, and added Drop-in to your payment form.
  2. Add WeChat Pay in your test Customer Area.
  3. Create a developer account on the WeChat Open Platform.
  4. Register your mobile app with WeChat.
  5. In Xcode, go to File > Project Settings > App Target > Info, and:
    a. Under URL Types, go to URL Schemes, and add your registered WeChatPay app ID with identifier weixin .
    b. Go to LSApplicationQueriesSchemes, and add weixin.
  6. Add WeChat Pay to CocoaPods or Carthage.

    CocoaPods

    Add pod 'Adyen/WeChatPay' to your Podfile.

    Carthage

    Add AdyenWeChatPay.framework to:

    • app "build settings"/"Build Phases"/"Embed Frameworks".
    • app "build settings"/"Build Phases"/"Link Binary to Libraries".
    • app "build settings"/"Build Phases"/"Dependencies".

Show WeChat Pay in your payment form

Drop-in uses the countryCode and the amount.currency from your /paymentMethods request to show the available payment methods to your shopper.

To show WeChat Pay in your payment form, specify in your /paymentMethods request:

WeChat Pay is only shown in the payment form if WeChat app is available in the shopper's device.

Make a payment

When the shopper proceeds to pay, Drop-in invokes the didSubmit method which contains data.paymentMethod.

  1. Pass data.paymentMethod to your server.
  2. From your server, make a /payments request, specifying:

    • paymentMethod: The data.paymentMethod from the didSubmit event from your client app.
    curl https://checkout-test.adyen.com/v53/payments \
    -H "x-API-key: YOUR_X-API-KEY" \
    -H "content-type: application/json" \
    -d '{
      "merchantAccount":"YOUR_MERCHANT_ACCOUNT",
      "reference":"YOUR_ORDER_NUMBER",
      "amount":{
        "currency":"CNY",
        "value":1000
      },
      "{hint:state.data.paymentMethod from didSubmit}paymentMethod{/hint}":{
        "type":"wechatpaySDK"
      }
    }'
    # Set your X-API-KEY with the API key from the Customer Area.
    adyen = Adyen::Client.new
    adyen.api_key = "YOUR_X-API-KEY"
     
    response = adyen.checkout.payments({
      :amount => {
        :currency => "CNY",
        :value => 1000
      },
      :reference => "YOUR_ORDER_NUMBER",
      :paymentMethod => {
        :type => "wechatpaySDK"
      },
      :merchantAccount => "YOUR_MERCHANT_ACCOUNT"
    })
    // Set YOUR_X-API-KEY with the API key from the Customer Area.
    // Change to Environment.LIVE and add the Live URL prefix when you're ready to accept live payments.
        Client client = new Client("YOUR_X-API-KEY", Environment.TEST);
        Checkout checkout = new Checkout(client);
    
        PaymentsRequest paymentsRequest = new PaymentsRequest();
    
        String merchantAccount = "YOUR_MERCHANT_ACCOUNT";
        paymentsRequest.setMerchantAccount(merchantAccount);
    
        Amount amount = new Amount();
        amount.setCurrency("CNY");
        amount.setValue(15000L);
        paymentsRequest.setAmount(amount);
    
        DefaultPaymentMethodDetails paymentMethodDetails = new DefaultPaymentMethodDetails();
        paymentMethodDetails.setType("wechatpaySDK");
        paymentsRequest.setPaymentMethod(paymentMethodDetails);
    
        paymentsRequest.setReference("YOUR_ORDER_NUMBER");
    
        PaymentsResponse paymentsResponse = checkout.payments(paymentsRequest);
    // Set your X-API-KEY with the API key from the Customer Area.
    $client = new \Adyen\Client();
    $client->setXApiKey("YOUR_X-API-KEY");
    $service = new \Adyen\Service\Checkout($client);
    
    $params = array(
      "amount" => array(
        "currency" => "CNY",
        "value" => 1000
      ),
      "reference" => "YOUR_ORDER_NUMBER",
      "paymentMethod" => array(
        "type" => "wechatpaySDK"
      ),
      "merchantAccount" => "YOUR_MERCHANT_ACCOUNT"
    );
    $result = $service->payments($params);
    #Set your X-API-KEY with the API key from the Customer Area.
    adyen = Adyen.Adyen()
    adyen.client.xapikey = 'YOUR_X-API-KEY'
    
    result = adyen.checkout.payments({
       'amount': {
          'value': 1000,
          'currency': 'CNY'
       },
       'reference': 'YOUR_ORDER_NUMBER',
       'paymentMethod': {
          'type': 'wechatpaySDK'
       },
       'merchantAccount': 'YOUR_MERCHANT_ACCOUNT'
    })
    // Set your X-API-KEY with the API key from the Customer Area.
    var client = new Client ("YOUR_X-API-KEY", Environment.Test);
    var checkout = new Checkout(client);
    
    var amount = new Model.Checkout.Amount("CNY", 1000);
    var details = new Model.Checkout.DefaultPaymentMethodDetails{
      Type = "wechatpaySDK"
    };
    var paymentRequest = new Adyen.Model.Checkout.PaymentRequest
    {
      Reference = "YOUR_ORDER_NUMBER",
      Amount = amount,
      MerchantAccount = "YOUR_MERCHANT_ACCOUNT",
      PaymentMethod = details
    };
    
    var paymentResponse = checkout.Payments(paymentsRequest);
    // Set your X-API-KEY with the API key from the Customer Area.
    const {Client, Config, CheckoutAPI} = require('@adyen/api-library');
    const config = new Config();
    // Set your X-API-KEY with the API key from the Customer Area.
    config.apiKey = '[API_KEY]';
    config.merchantAccount = '[YOUR_MERCHANT_ACCOUNT]';
    const client = new Client({ config });
    client.setEnvironment("TEST");
    const checkout = new CheckoutAPI(client);
    checkout.payments({
        amount: { currency: "CNY", value: 1000 },
        paymentMethod: {
            type: 'wechatpaySDK'
        },
        reference: "YOUR_ORDER_NUMBER",
        merchantAccount: config.merchantAccount
    }).then(res => res);

    The /payments response includes an action object that contains information about the app switch.

  3. Store the action.paymentData on your server, and pass the action object to your client app.

    /payments response
    {
        "resultCode": "Pending",
        "action": {
            "{hint:Store this on your server}paymentData{/hint}": "Ab02b4c0!BQABAgAgx==...",
            "paymentMethodType": "wechatpaySDK",
            "type": "wechatpaySDK",
            "sdkData": {
                "appid": "wx3aed7fe146f6a57a",
                "noncestr": "cPY0e83ny4hWyf5O",
                "packageValue": "Sign=WXPay",
                "partnerid": "205287714",
                "prepayid": "wx015678064827111da2e4f0b11005864100",
                "sign": "169FD3F1E193446D90C45573EBDD4020",
                "timestamp": "1573033086"
            }
        },
        "details": [
            {
                "key": "resultCode",
                "type": "text"
            }
        ],
        ...
    }

Check the payment result

Drop-in uses the action object to launch the WeChat app, where the shopper completes the payment, and is then redirected back to your app. When the shopper returns to your app, Drop-in provides the actionComponentData object.

  • From your server, make a /payments/details request containing:

    • details: The actionComponentData.details from Drop-in.
    • paymentData: The value from the /payments response.
    curl https://checkout-test.adyen.com/v53/payments/details \
    -H "x-API-key: YOUR_X-API-KEY" \
    -H "content-type: application/json" \
    -d '{
       "{hint:actionComponentData from app}details{/hint}": {
          "resultCode": "0"
       },
       "{hint:Value that you stored on your server}paymentData{/hint}":"Ab02b4c0!BQABAgAKspbjN8+5..."
    }'
    # Set your X-API-KEY with the API key from the Customer Area.
    adyen = Adyen::Client.new
    adyen.env = :test
    adyen.api_key = "YOUR_X-API-KEY"
    
    request = DROPIN_ACTION_COMPONENT_DATA
    #  Data object passed from actionComponentData from the client app, parsed from JSON to a Hash.
    
    response = adyen.checkout.payments.details(request)
    
    # Check if further action is needed.
    if response.body.has_key(:action)
       # Pass the action object to your frontend
       puts response.body[:action]
    else
       # No further action needed, pass the resultCode to your frontend
       puts response.body[:resultCode]
    end
    // Set your X-API-KEY with the API key from the Customer Area.
    Client client = new Client(xApiKey,Environment.TEST);
    
    Checkout checkout = new Checkout(client);
    PaymentsDetailsRequest paymentsDetailsRequest = new PaymentsDetailsRequest();
    HashMap<String, String> details = new HashMap<>();
    details.put("resultCode", "0");
    paymentsDetailsRequest.setDetails(details);
    paymentsDetailsRequest.setPaymentData("Ab02b4c0!BQABAgAKspbjN8+5...");
    PaymentsResponse paymentsResponse = checkout.paymentsDetails(paymentsDetailsRequest);
    // Set your X-API-KEY with the API key from the Customer Area.
    $client = new \Adyen\Client();
    $client->setXApiKey("YOUR_X-API-KEY");
    $service = new \Adyen\Service\Checkout($client);
    
    $params = DROPIN_ACTION_COMPONENT_DATA;
    //  Data object passed from actionComponentData from the client app, parsed from JSON to an array
    
    $result = $service->paymentsDetails($params);
    
    // Check if further action is needed
    if (array_key_exists("action", $result){
       // Pass the action object to your frontend.
       // $result["action"]
    }
    else {
       // No further action needed, pass the resultCode to your front end
       // $result['resultCode']
    }
    #Set your X-API-KEY with the API key from the Customer Area.
    adyen = Adyen.Adyen()
    adyen.client.xapikey = 'YOUR_X-API-KEY'
    
    request = DROPIN_ACTION_COMPONENT_DATA
    #  Data object passed from actionComponentData from the client app, parsed from JSON to a dictionary
    
    result = adyen.checkout.payments_details(request)
    
    # Check if further action is needed.
    if 'action' in result.message:
       # Pass the action object to your front end
       # result.message['action']
    else:
       # No further action needed, pass the resultCode to your front end
       # result.message['resultCode']
    // Set your X-API-KEY with the API key from the Customer Area.
    var client = new Client ("YOUR_X-API-KEY", Environment.Test);
    var checkout = new Checkout(client);
    string paymentData = "Ab02b4c0!BQABAgAKspbjN8+5...";
    
    var details = new Dictionary<string, string>
    {
      { "resultCode", "0" }
    };
    var paymentsDetailsRequest = new Model.Checkout.PaymentsDetailsRequest(Details: details);
    var paymentResponse = checkout.PaymentDetails(paymentsDetailsRequest);
    // Set your X-API-KEY with the API key from the Customer Area.
    const {Client, Config, CheckoutAPI} = require('@adyen/api-library');
    const config = new Config();
    // Set your X-API-KEY with the API key from the Customer Area.
    config.apiKey = '[API_KEY]';
    config.merchantAccount = '[YOUR_MERCHANT_ACCOUNT]';
    const client = new Client({ config });
    client.setEnvironment("TEST");
    const checkout = new CheckoutAPI(client);
    checkout.paymentsDetails({
         details: {DROPIN_ACTION_COMPONENT_DATA}  // Data object passed from the client app.
    }).then(res => res);

Present the payment result

Use the resultCode that you received in the /payments/details response to present the payment result to your shopper.

The resultCode values you can receive for WeChat Pay are:

resultCode Description Action to take
Authorised The payment was successful. Inform the shopper that the payment has been successful.
You will receive the funds in 2-3 days.
Cancelled The shopper cancelled the payment while on the WeChat app. Ask the shopper whether they want to continue with the order, or ask them to select a different payment method.
Error There was an error when the payment was being processed. Inform the shopper that there was an error processing their payment. The response contains a refusalReason, indicating the cause of the error.
Pending or
Received
The payment order was successfully received. Inform the shopper that you've received their order, and are waiting for the payment to clear.
You will receive the final result of the payment in an AUTHORISATION notification. If successful, you will receive the funds in 2 days.
Refused The payment was refused by the shopper's bank. Ask the shopper to try the payment again using a different payment method.

Test and go live

WeChat Pay currently has no test platform. If you have a personal WeChat account you can test your integration by either:

  • Cancelling the transaction when you are asked to verify the payment (recommended).
  • Making live WeChat Pay payments with a low value.

You can check the status of a WeChat Pay payment in your Customer Area > Transactions > Payments.

Before you can accept live WeChat Pay payments, you need to submit a request for WeChat Pay in your live Customer Area.

See also