The Antom SDK is a pre-built UI component that simplifies the process of integrating Antom payment services. This component offers a simple and quick way to integrate all payment methods supported by Antom, including credit cards, digital wallets, bank transfers, online banking, and more.

The SDK component can automatically adapt to the buyer's device and location, performing tasks such as information collection, redirection, switching between apps, displaying QR codes, and more based on the characteristics of the payment method. You can easily provide a comprehensive payment solution on your website or application, saving a significant amount of time and resources required to build each payment API and process.

User experience

The following figures show the user journey of paying on a shopping website or mobile web app:

Note: If you want to provide buyers with an Alipay+ unified payment experience instead of the above user experience, see Alipay+ unified payment cashier and contact Antom technical support for more integration details.

Payment flow

For each payment method, the payment flow is composed of the following steps:

1. The buyer lands on the checkout page.
2. Create a payment session request.
   After the buyer selects a payment method and submits the order, you can obtain the payment session by calling the createPaymentSession (Checkout Payment) API.
3. Invoke the client SDK.
   On the client side, invoke the SDK through the payment session. The SDK will handle information collection, redirection, app invocation, QR code display, verification, and other processes based on the payment method's characteristics.
4. Get the payment result.
   Obtain the payment result by using one of the following two methods:

• Asynchronous Notification: Specify the paymentNotifyUrl in the createPaymentSession (Checkout Payment) API to set the address for receiving asynchronous notifications. When the payment is successful or expires, Antom will use notifyPayment to send asynchronous notifications to you.
• Synchronous Inquiry: Call the inquiryPayment API to check the payment status.

Integration steps

Start your integration by taking the following steps:

1. Create a payment session
2. Create and invoke the SDK
3. Obtain payment result

Step 1: Create a payment session Server-side

When a buyer selects a payment method provided by Antom, you need to collect key information such as the payment request ID, order amount, payment method, order description, payment redirect URL, and payment result notification URL, call the  createPaymentSession (Checkout Payment) API to create a payment session, and return the payment session to the client.

Antom provides server-side API libraries for multiple languages. The following codes use Java as an example. You need to install Java 6 or higher.

Install an API library

You can find the latest version on GitHub.

<dependency>
    <groupId>com.alipay.global.sdk</groupId>
    <artifactId>global-open-sdk-java</artifactId>
    <version>2.0.36</version>
</dependency>

Initialize the request instance

Create a singleton resource to make a request to Antom.

import com.alipay.global.api.AlipayClient;
import com.alipay.global.api.DefaultAlipayClient;
import com.alipay.global.api.model.constants.EndPointConstants;

public class Sample {
    public static final String        CLIENT_ID            = "";
    public static final String        ANTOM_PUBLIC_KEY     = "";
    public static final String        MERCHANT_PRIVATE_KEY = "";

    private final static AlipayClient CLIENT               = new DefaultAlipayClient(
            EndPointConstants.SG, MERCHANT_PRIVATE_KEY, ANTOM_PUBLIC_KEY, CLIENT_ID);

}

Create a payment session

Creating a payment session includes the following parameters:

The above parameters are the basic parameters for creating a payment session, for full parameters and additional requirements for certain payment methods please refer to createPaymentSession (Checkout Payment).

Sample code of calling the createPaymentSession API

The following sample code shows how to call the createPaymentSession (Checkout Payment) API:

private static void createPaymentSession() {
    AlipayPaymentSessionRequest alipayPaymentSessionRequest = new AlipayPaymentSessionRequest();
    alipayPaymentSessionRequest.setProductCode(ProductCodeType.CASHIER_PAYMENT);

    // replace with your paymentRequestId
    String paymentRequestId = UUID.randomUUID().toString();
    alipayPaymentSessionRequest.setPaymentRequestId(paymentRequestId);

    // set amount
    Amount amount = Amount.builder().currency("SGD").value("4200").build();
    alipayPaymentSessionRequest.setPaymentAmount(amount);

    // set paymentMethod
    PaymentMethod paymentMethod = PaymentMethod.builder().paymentMethodType("SHOPEEPAY_SG").build();
    alipayPaymentSessionRequest.setPaymentMethod(paymentMethod);

    // replace with your orderId
    String orderId = UUID.randomUUID().toString();

    // set buyer info
    Buyer buyer = Buyer.builder().referenceBuyerId("yourBuyerId").build();

    // set order info
    Order order = Order.builder().referenceOrderId(orderId)
        .orderDescription("antom testing order").orderAmount(amount).buyer(buyer).build();
    alipayPaymentSessionRequest.setOrder(order);

    // replace with your notify url
    alipayPaymentSessionRequest.setPaymentNotifyUrl("https://www.yourNotifyUrl.com");

    // replace with your redirect url
    alipayPaymentSessionRequest.setPaymentRedirectUrl("https://www.yourMerchantWeb.com");

    AlipayPaymentSessionResponse alipayPaymentSessionResponse = null;
    try {
        alipayPaymentSessionResponse = CLIENT.execute(alipayPaymentSessionRequest);
    } catch (AlipayApiException e) {
        String errorMsg = e.getMessage();
        // handle error condition
    }
}

The following code shows a sample of the request message:

{
  "order": {
    "buyer": {
      "referenceBuyerId": "yourBuyerId"
    },
    "orderAmount": {
      "currency": "SGD",
      "value": "4200"
    },
    "orderDescription": "antom testing order",
    "referenceOrderId": "referenceOrderId01"
  },
  "paymentAmount": {
    "currency": "SGD",
    "value": "4200"
  },
  "paymentMethod": {
    "paymentMethodType": "SHOPEEPAY_SG"
  },
  "paymentNotifyUrl": "https://www.yourNotifyUrl.com",
  "paymentRedirectUrl": "https://www.yourMerchantWeb.com",
  "paymentRequestId": "paymentRequestId01",
  "productCode": "CASHIER_PAYMENT"
}

The following code shows a sample of the response, which contains the following parameters:

• paymentSessionData: the payment session to be returned to the frontend
• paymentSessionExpiryTime: the expiration time of the payment session.

{
  "paymentSessionData": "gM5Y/Go6+IXMPSOZrYtukCdodtwxuSFsn1vRPSB8CzkDqlb1g2W7dDipOkoMRs/x2W7g7qVhjEM7RUGroIT8Cw==&&SG&&188&&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",
  "paymentSessionExpiryTime": "2024-01-01T00:00:00+08:00",
  "paymentSessionId": "gM5Y/Go6+IXMPSOZrYtukCdodtwxuSFsn1vRPSB8Czn6HfgqNzo2ogbIk1NUQS35",
  "result": {
    "resultCode": "SUCCESS",
    "resultMessage": "success.",
    "resultStatus": "S"
  }
}

Common questions

Q: Can I use Chinese characters in the value of the request parameters?

A: To avoid incompatibility of a certain payment method, do not use Chinese characters for fields in the request.

Q: How to set the URL to receive the payment notification?

A: Specify paymentNotifyUrl in the createPaymentSession (Checkout Payment) API to receive the asynchronous notification about the payment result (notifyPayment), or configure the receiving URL in Antom Dashboard. If the URL is specified in both the request and Antom Dashboard, the value specified in the request takes precedence.

Step 2: Create and invoke the SDK Client-side

The Antom SDK is a component used for handling payment processes. You initiate the SDK by creating a payment session to collect information, switch between apps, and display QR codes based on the payment method specified in  createPaymentSession (Checkout Payment) API.

After the buyer selects a payment method on the page, you need to create the SDK and initiate it with a payment session.

Install

Before beginning the integration, make sure that you have completed the following environment preparations:

• Properly handle compatibility issues: Provide corresponding polyfills for Internet Explorer and other old browser versions. We recommend that you use babel-preset-env to address browser compatibility issues when you build a project.
• Use the following recommended browser versions:

• For mobile browsers:

• iOS 11 and later.
• Android 5.0 and later.

• For computer browsers, use the following recommended versions:

To integrate the SDK package, refer to Integrate the SDK Package for Web/WAP.

Instantiate the SDK

Create the SDK instance by using the AMSCashierPayment and specify basic configurations. Configuration objects includes the following parameters:

The following sample code shows how to obtain the browser language:

let language = navigator.language || navigator.userLanguage;
language = language.replace("-", "_"); // Replace "-" with "_"

The following sample code shows how to instantiate the SDK:

// import { AMSCashierPayment } from '@alipay/ams-checkout'

const checkoutApp = new window.AMSCashierPayment({
  environment: "sandbox",
  locale: "en_US",
  onLog: ({code, message}) => {},
  onEventCallback: ({code, message}) => {},
});

//Request the server to get paymentSessionData

Invoke the SDK

Use the createComponent function in the instance object to create a payment component:

The following sample code shows how to call createComponent:

async function create(sessionData) {
  await checkoutApp.createComponent({ 
    sessionData: sessionData, 
    appearance:{
      showLoading: true, // Set as true by default to enable the default loading pattern
    }
  });
}

Call the unmount method to free SDK component resources in the following situations:

• When the buyer switches views to exit the checkout page, free the component resources created in the createPaymentSession (Checkout Payment).
• When the buyer initiates multiple payments, free the component resources created in the previous createPaymentSession (Checkout Payment).
• When the buyer completes the payment and sets notRedirectAfterComplete to true, free the component resources after obtaining specific payment result codes.

// Free SDK component resources
checkoutApp.unmount();

Common questions

Q: What can I do when I receive SDK_CREATEPAYMENT_PARAMETER_ERROR?

A: When you receive this event code, check if the sessionData passed in is correct and complete.

Q: What can I do when I receive SDK_PAYMENT_ERROR or a rendering view error occurred?

A: Check the network request for any exceptions during API initialization, such as network timeouts. Ensure that the environment for creating payment session request is consistent with the environment used for SDK instantiation. Check whether the parameters in the createPaymentSession (Checkout Payment) API are passed correctly. If the API exceptions persist, feel free to contact us for further troubleshooting.

Display payment results

You can use the payment component to handle payment methods which require a redirect (asynchronous payments), and those that do not (synchronous payments).

Redirect payment

The payment process of some payment methods needs to leave the original web page and jump to the organization's page to complete the payment, such as the payment method of online banking. In this case, the buyer is redirected to the paymentRedirectUrl that you provided in the createPaymentSession (Checkout Payment) API after completing the payment. You can obtain the payment result by active query and and show it to the buyer in that URL.

Non-redirect payment

For payment without redirection, the payment result will be given through the onEventCallback function. The payment result here is only for front-end display, and the final order status is subject to the server side.

You need to customize the processing flow you want for each payment result through the data in the result of onEventCallback.

The following are the possible event codes of the payment result returned by onEventCallback.

The following sample code shows how to process the onEventCallback:

function onEventCallback({ code, result }) {
  switch (code) {
    case 'SDK_PAYMENT_SUCCESSFUL':
      // Payment was successful. Redirect buyers to the payment result page.
      break;
    case 'SDK_PAYMENT_PROCESSING':
      console.log('Check the payment result data', result);
      // Payment was being processed. Guide buyers to retry the payment based on the provided information.
      break;
    case 'SDK_PAYMENT_FAIL':
      console.log('Check the payment result data', result);
      // Payment failed. Guide buyers to retry the payment based on the provided information.
      break;
    case 'SDK_PAYMENT_CANCEL':
      // Guide buyers to retry the payment.
      break;
    case 'SDK_PAYMENT_ERROR':
      console.log('Check the payment result data', result);
      // The payment status was abnormal. Guide buyers to retry the payment based on the provided information.
      break;
    default:
      break;
  }
}

Step 3: Obtain payment result Server-side

After the buyer completes the payment or the payment times out, Antom sends the corresponding payment results to you through server interactions, you can obtain the payment result by one of the following methods:

• Receive the asynchronous notification
• Inquire about the result

Receive the asynchronous notification

When the payment reaches a final status of success or failure, Antom sends an asynchronous notification to the paymentNotifyUrl specified in the createPaymentSession (Checkout Payment) API through the notifyPayment API. When you receive the notification from Antom, you are required to return a response as instructed in Return a receipt acknowledgment message.

Antom allows you to specify the URL in the paymentNotifyUrl parameter within the createPaymentSession (Checkout Payment) API. If the URL for each payment is the same, you can also configure it in the Antom Dashboard.

The following code shows a sample of the notification request:

{
  "notifyType": "PAYMENT_RESULT",
  "result": {
    "resultCode": "SUCCESS",
    "resultStatus": "S",
    "resultMessage": "success"
  },
  "paymentRequestId": "paymentRequestId01",
  "paymentId": "20240101123456789XXXX",
  "paymentAmount": {
    "value": "4200",
    "currency": "SGD"
  },
  "paymentCreateTime": "2024-01-01T00:00:00+08:00",
  "paymentTime": "2024-01-01T00:01:00+08:00"
}

How to verify the signature of the notification and make a response to the notification, see Sign a request and verify the signature.

Common questions

Q: When will the notification be sent?

A: It depends on whether the payment is completed:

• If the payment is successfully completed, Antom will usually send you an asynchronous notification within 3 to 5 seconds. For some payment methods like OTC, the notification might take a bit longer.
• If the payment is not completed, Antom needs to close the order first before sending an asynchronous notification. The time it takes for different payment methods to close the order varies, usually defaulting to 14 minutes.

Q: Will the asynchronous notification be re-sent?

A: Yes, the asynchronous notification will be re-sent automatically within 24 hours for the following cases:

• If you didn't receive the asynchronous notification due to network reasons.
• If you receive an asynchronous notification from Antom, but you didn't make a response to the notification in the Sample code format.

The notification can be resent up to 8 times or until a correct response is received to terminate delivery. The sending intervals are as follows: 0 minutes, 2 minutes, 10 minutes, 10 minutes, 1 hour, 2 hours, 6 hours, and 15 hours.

Q: When responding to asynchronous notification, do I need to add a digital signature?

A: If you receive an asynchronous notification from Antom, you are required to return the response in the Sample code format, but you do not need to countersign the response.

Q: What are the key parameters in the notification that I need to use?

A: Pay attention to the following key parameters:

• result: indicates the payment result of the order.
• paymentRequestId: indicates the payment request number you generated for consult, cancel, and reconciliation.
• paymentId: indicates the payment order number generated by Antom used for refund and reconciliation.
• paymentAmount: indicates the payment amount.

Inquire about the result

You can call the inquiryPayment API to initiate a query on the result of an order.

The parameter is not a full set of parameters, please refer to the inquiryPayment API for full set of parameters and additional requirements for certain payment methods.

The following sample code shows how to call the inquiryPayment API:

public static void inquiryPayment() {
    AlipayPayQueryRequest alipayPayQueryRequest = new AlipayPayQueryRequest();

    // replace with your paymentRequestId
    alipayPayQueryRequest.setPaymentRequestId("yourPaymentRequestId");

    AlipayPayQueryResponse alipayPayQueryResponse = null;
    try {
        alipayPayQueryResponse = CLIENT.execute(alipayPayQueryRequest);
    } catch (AlipayApiException e) {
        String errorMsg = e.getMessage();
        // handle error condition
    }
}

The following code shows a sample of the request message:

{
  "paymentRequestId": "paymentRequestId01"
}

The following code shows a sample of the response message:

{
  "result": {
    "resultCode": "SUCCESS",
    "resultStatus": "S",
    "resultMessage": "Success"
  },
  "paymentStatus": "SUCCESS",
  "paymentRequestId": "paymentRequestId01",
  "paymentId": "20240101123456789XXXX",
  "paymentAmount": {
    "value": "4200",
    "currency": "SGD"
  },
  "paymentCreateTime": "2024-01-01T00:00:00+08:00",
  "paymentTime": "2024-01-01T00:01:00+08:00",
  "paymentMethodType": "SHOPEEPAY_SG"
}

Common questions

Q: How often should I call the inquiryPayment API?

A: Call the inquiryPayment API constantly with an interval of 2 seconds until the final payment result is obtained or an asynchronous payment result notification is received.

Q: What are the key parameters in the notification that I need to use?

A: Pay attention to these key parameters:

• result: represents the result of this inquiryPayment API call, the result of the order needs to be judged according to paymentStatus:

• SUCCESS and FAIL represent the final result.
• PROCESSING represents the processing.

• paymentAmount: indicates the payment amount.

Sample codes

Full sample codes for front-end:

// Step 1: Instantiate the SDK and handle the callback event.
const onEventCallback = function({ code, result }) {
  switch (code) {
    case 'SDK_PAYMENT_SUCCESSFUL':
      // Payment was successful. Redirect buyers to the payment result page.
      break;
    case 'SDK_PAYMENT_PROCESSING':
      console.log('Check the payment result data', result);
      // Payment was being processed. Guide buyers to retry the payment based on the provided information.
      break;
    case 'SDK_PAYMENT_FAIL':
      console.log('Check the payment result data', result);
      // Payment failed. Guide buyers to retry the payment based on the provided information.
      break;
    case 'SDK_PAYMENT_CANCEL':
      // Guide buyers to retry the payment.
      break;
    case 'SDK_PAYMENT_ERROR':
      console.log('Check the payment result data', result);
      // The payment status was abnormal. Guide buyers to retry the payment based on the provided information.
      break;
    default:
      break;
  }
}
const checkoutApp = new window.AMSCashierPayment({
  environment: "sandbox",
  locale: "en_US",
  onLog: ({code, message}) => {},
  onEventCallback: onEventCallback,
});
// Handle payment button events.
document
  .querySelector("#your form id")
  .addEventListener("submit", handleSubmit);

async function handleSubmit() {
  // Step 2: The server calls createPaymentSession API to obtain paymentSessionData.
  async function getPaymentSessionData() {
    const url = "Fill in the server address";
    const config = {
      // Fill in the request configuration.
    };
    const response = await fetch(url, config);
    // Obtain the value of the paymentSessionData parameter in the response.
    const { paymentSessionData } = await response.json();
    return paymentSessionData;
  }
  const paymentSessionData = await getPaymentSessionData();

  // Step 3: Create rendering components.
  await checkoutApp.createComponent({ 
    sessionData: paymentSessionData, 
    appearance:{
      showLoading: true, // Set as true by default to enable the default loading pattern.
    }, 
  });
}

Event codes

You might see two types of event codes:

• Status codes: Returned by onEventCallback during the component's runtime lifecycle.
• Error codes: Returned by onEventCallback or onError during the component initialization phase.