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Guest user checkout

This page describes how to embed a Card Element on your payment page to accept payments.

How it works

The diagram below depicts the information flow in a Card Element integration. Card Element Sequence

Before you begin

Before you implement the integration, consider the following:

Step 1: Set up the server to create a PaymentIntent

When the shopper begins the checkout process, you will need to create a PaymentIntent object to indicate your intent to collect payment from the shopper.

When the checkout page loads, on your server, call Create a PaymentIntent API API with an amount and currency. Always decide how much to charge on the server side, a trusted environment, as opposed to the client. This prevents malicious shoppers from being able to alter the payment amount.

Provide return_url in Create a PaymentIntent API to indicate where Airwallex should redirect the shopper after completing the payment, whether successful or otherwise.

The PaymentIntent’s id and client_secret are returned in the response these parameters let you confirm the payment and update card details on the client, without allowing manipulation of sensitive information, like payment amount.


Step 2: Initialize Airwallex on your checkout page

First, you will need to import the airwallex-payment-elements SDK and then initialize the package. For details, see Initialize Airwallex JS.

Step 3: Add the Card Element to your checkout page

To embed the Card Element into your checkout page, you will need to create an empty container, create the Element and then mount the Element to the container.

Define the payment form

First, create an empty container div with a unique id in your payment form and a Submit button to trigger the payment request. Ensure that the payment form only contains one Element with this unique id. Airwallex inserts an iframe into this div that securely collects card information.


Create the Card Element

When the payment form has loaded, call createElement(type, options) by specifying the Element type as card to create the Element. Ensure that the payment form only contains one Element with card id.


Mount the Card Element

Call mount() with the id of the div to mount the Element to the DOM. The Element should only be mounted once in a single payment flow.


Card props

You can also pass options in createElement() to overwrite styles and other functions as shown in the following table. All properties are optional. For details, see card props JS.

Step 4: Confirm the PaymentIntent

When the shopper clicks the Submit button, call confirmPaymentIntent() by passing the Element, id and client_secret returned in Create a PaymentIntent, to complete the payment.


You can also pass options in confirmPaymentIntent() depending on your payment flow. For details, see confirmPaymentIntent props JS.

Handle the submit event

Add an event handler to the Submit button and listen to the form’s submit event to know when to confirm the payment.


Add onReady event listener to ensure the Elements are mounted. Use this event to prepare and load the checkout page.


Add onChange event listener to help your shopper catch mistakes in the input fields. Use this to validate the fields and display errors before the shopper clicks the Submit button.


Step 5: Handle the response

Add onSuccess and onError event listeners to handle error and success events received from Airwallex.


If no error occurred, display a message that the payment was successful. If payment fails with an error, display the appropriate message to your shopper so they can take action and try again.

Retrieve the payment result

For any actions subsequent to the payment such as shipping goods or sending email receipts, you can retrieve the payment result using the following options:

  • Set up webhooks to receive notifications on whether the payment has succeeded. Airwallex sends payment_intent.succeeded event when a payment succeeds. Listen to these events rather than waiting on a callback from the client. On the client, the shopper could close the browser window or quit the app before the callback executes. For information on how to set up webhooks and listen to events, see Getting started with webhooks

  • On your server, call Retrieve a PaymentIntent API to check the PaymentIntent status.

  • Check Payment Activity screen on your Airwallex web app.

Test your integration

Use test card numbers and the test and go-live checklist to test your integration for various success and error scenarios in the demo environment and then go live in the production environment.

Example integrations

Explore a full, working code sample of an integration built using various web frameworks JS.

Supported features

You can add the following features to your Embedded Element integration.


You can configure the Element to display localized text of the payment fields based on the locale set in init() or loadAirwallex( ). See supported locales JS.

Save card details for future payments

Airwallex allows you to create a PaymentConsent with the shopper to initiate future payments using shopper’s saved card details. For more information, see Save payment details for future payments.

3D Secure authentication

Airwallex automatically handles 3D Secure authentication offering either frictionless or challenge flow depending on the card issuer’s requirements. You can optionally pass the following fields in createElement( ) to support 3DS:

  • authFormContainer: A container for the authentication form. If a challenge flow is required to authenticate the shopper, an iframe will be rendered in this container to display the authentication page provided by the issuing bank. If not provided, Airwallex will create a div after body tag and use it as the container.
  • withBilling: If applicable set this to true to collect billing information from the shopper, which increases the likelihood of frictionless checkout.

Device fingerprinting

Device fingerprinting uniquely tracks and identifies devices used for transacting on your shopping site, increasing your protection from fraud. The airwallex-payment-elements JavaScript client library automatically handles device fingerprinting, so no additional integration is needed.


Some common error scenarios include :

ErrorNext steps
Airwallex is not definedCheck if you have initialized Airwallex (Step 2) before using Airwallex functions. If you are using CDN, check if you have changed the bundle version from x.x.x to the latest version in the package.json file. For example, is invalid
Access denied, authentication failedCheck if you have replaced your intent id and client_secret in createElement() and optionally confirmPaymentIntent().
The PaymentIntent with ID int_xxxxxxxxx cannot be foundCheck if the environment you initialized Airwallex in, for example, demo or prod, matches the environment you retrieved your intent id and client_secret from. In other words, if you ran init in the demo environment, you must also create your PaymentIntent in the demo environment.
InvalidAccessError: Page already has an active payment sessionApplePay doesn't allow duplicate sessions in the same page. However, you may create the apple pay element multiple times, please follow either of the options listed to address the error: 1) Call the destroy function to destroy old element before you create the new element. 2) Call the update function to update the old element with new intentId.
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