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Using the Google Pay widget allows customer to pay with regular cards stored to his Google account, as well as tokenized Google Pay cards. On devices without the installed Google Pay application, the customer will be asked to select a stored card from Google.

...

To deploy a widget on an online store page, do the following:

place the widget on the payment page of the online store;
customize the widget;
check the possibility of payment using the widget;
- transfer the order parameters;
- receive and process the payment result.

Description of the widget

The widget is an HTML code and a JS script that you need to place and configure on the payment page of your online store.

Widget installation

In that place of the online store page where you plan to place the Apple Pay payment button, you need to add the following code:

Widget installation

In that place of the online store page where you plan to place the Apple Pay payment button, you need to add the following code:

Code Block

language	js

<div id="container"></div>

The Google Pay payment button will be placed in the id="container" tag. A tag identifier can be assigned a different value, if necessary. To do this, you must make the appropriate changes to the createButton method of the addGooglePayButton function, for example:

Code Block

language	js

document.getElementById('mynewcontainer').style.display = 'block'; //mynewcontainer — new tag ID

Additionally, on the same page, you must connect the JS script to call the Google Pay API and the JS payment script.

Code Block

language	js

<script async src="https://pay.google.com/gp/p/js/pay.js" onload="onGooglePayLoaded()"></script>

Widget customization

To configure the environment, you must set the environment parameter in the getGooglePaymentsClient function. To operate with real data, you must specify the value ’PRODUCTION’, and for testing - the value ’TEST’.

Code Block

language	js

function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
  paymentsClient = new google.payments.api.PaymentsClient({environment: 'TEST'});
  }
  Return paymentsClient;
}

Next, you need to specify the type of authentication cards that will be accepted for payment in the online store. For this, the allowedCardAuthMethods parameter is used, which can take the following values:

"PAN_ONLY" - authentication of cards stored in a Google account;

“CRYPTOGRAM_3DS” - authentication of cards stored as Google Pay tokens is used only on mobile devices with the installed Google Pay application.

Code Block

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const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

You should also determine which cards of payment systems will be accepted for payment in the online store. The allowedCardNetworks parameter is used for this:

Code Block

language	js

const allowedCardNetworks = ["MASTERCARD", "VISA"];

Now you need to insert the online store identifier into the widget script (gatewayMerchantId parameter):

Code Block

language	js

const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'assist',
    'gatewayMerchantId': '02510116604241796260'
  }
}

The connected Google Pay API JS script launches a handler that checks the device and displays a button:

Code Block

language	js

function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient()
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest()) //device check
    .then(funtion(response) {
      If (response.result) {
      addGooglePayButton(); //button display
       prefetchGooglePaymentData();
       }
    })
    .catch(function(err) { //error processing
      console.error(err); //error output to the console
    })
}

To display the button, the script calls the addGooglePayButton function. In this case, you can customize the appearance of the Google Pay button. To do this, make changes to the createButton method:

buttonColor – sets the color of the button; possible values are black and white;
buttonType - sets the button type, possible values are long and short.

For more information on adding a button, see the Google Pay API documentation https://developers.google.com/pay/api/web/reference/object?hl=ru#ButtonOptions.

An example of the addGooglePayButton function that adds a large black button:

Code Block

language	js

function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
     paymentsClient.createButton({onClick: onGooglePaymentButtonClicked, buttonColor:'black', buttonType:'long'}); //button creation
        document.getElementById('container').appendChild(button); // adding a button to a page
        document.getElementById('container').style.display = 'block';
}

Warning
When setting up the button, you must consider the requirements for branding Google.

If the device supports payment using Google Pay, a button will be displayed in accordance with the settings.

Clicking the button initiates the transfer of operation information to Google Pay using the getGoogleTransactionInfo function.

The following parameters should be passed for the operation:

currencyCode — order currency;
totalPrice — order amount;
totalPriceStatus — order amount status.

The totalPriceStatus parameter can take the following values:

NOT_CURRENTLY_KNOWN — is used to check payment options;
ESTIMATED — order amount can be changed later, depending on the response;
FINAL — the order amount is final, will not change in the process.

Example of getGoogleTransactionInfo function:

Code Block

language	js

function getGoogleTransactionInfo() {
  return {
    currencyCode: $('#currency').val(), //order currency
    totalPriceStatus: 'FINAL', //order amount status
    totalPrice: $('#amount').val() //order amount
  };
}

After the payment is confirmed by the customer, the result will be returned to the processPayment function.

To make a payment, order data should be transferred to the widget (processPayment function).

List of the ProcessPayment function parameters

Parameter	Description
merchant_id	The merchant identifier in IPS Assist
amount	Payment amount, in original currency
currency	Order currency
ordernumber	Order number in the merchant payments system
comment	Order comment
email	Customer's e-mail
firstname	Customer's first name
lastname	Customer's last name
middlename	Customer's middle name

The values may include field names of the completed payment form.

Example of the processPayment funktion:

Code Block

language	js

function processPayment(paymentData) {
  var data = {
        paymentData : paymentData,
        merchant_id : $('#merchantId').val(), //merchant ID
        amount : $('#amount').val(), //order amount
        currency : $('#currency').val(), //currency
        ordernumber : $('#ordernumber').val(), //order number
        email : $('#email').val(), //customer’s email
        firstname : $('#firstname').val(), //Customer's first name
        middlename : $('#middlename').val(),//Customer's middle name
        lastname : $('#lastname').val() //Customer's last name
        comment : $('#comment').val() //комментарий к заказу
  };

After payment using Google Pay is completed, the server returns the order number and status in response. To process the response, you must add the appropriate code to this processPayment function:

Code Block

language	js

$.post("/pay/tokenpay_widget_gp.cfm", JSON.stringify(data)).then(function (result) {
   //here should be processing the response from the payment service
   // this is an response example {"order":{"ordernumber":"2019.03.11-664","orderstate":"Approved"}}
});

If for some reason the order payment was unsuccessful, then the service will return error messages (with appropriated values of the firstcode and secondcode parameters).

The script uses the Google Pay API, which is used:

on all mobile devices, regardless of operating system;
in browsers Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge, Opera or UCWeb UC Browser.

Warning
Google Pay does not have the ability to store a special test card, so when testing it will display a real card. However, in the test environment of Google this card will be replaced by a test one and test card data will be returned to the script. In this way you can use a stored real card without debiting from it.

Script example

Below you can see an example of a widget script that can be placed on the payment page of an online store.

Code Block

language	js

<script type="text/javascript">
const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};
 
const allowedCardNetworks = ["MASTERCARD", "VISA"];
const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];
 
const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'assist',
    'gatewayMerchantId': '02510116604241796260'
  }
}
 
const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks,
    billingAddressRequired: true,
    billingAddressParameters: {"format": "MIN"}
   }
}
 
const cardPaymentMethod = Object.assign(
  {},
  baseCardPaymentMethod,
  {
    tokenizationSpecification: tokenizationSpecification
  }
);
 
let paymentsClient = null;
 
function getGoogleIsReadyToPayRequest() {
  return Object.assign(
      {},
      baseRequest,
      {
        allowedPaymentMethods: [baseCardPaymentMethod]
      }
  );
}
 
/**
* Configure support for the Google Pay API
*
* @see {@link https://developers.google.com/pay/api/web/reference/object#PaymentDataRequest|PaymentDataRequest}
* @returns {object} PaymentDataRequest fields
*/
function getGooglePaymentDataRequest() {
  const paymentDataRequest = Object.assign({}, baseRequest);
  paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
  paymentDataRequest.merchantInfo = {
    // @todo a merchant ID is available for a production environment after approval by Google
    // See {@link https://developers.google.com/pay/api/web/guides/test-and-deploy/integration-checklist|Integration checklist}
    merchantId: '16590966430175452581',
    merchantOrigin: 'www.assist.ru',
    merchantName: 'ASSIST Merchant'
  };
  return paymentDataRequest;
}
 
/**
* Return an active PaymentsClient or initialize
*
* @see {@link https://developers.google.com/pay/api/web/reference/client#PaymentsClient|PaymentsClient constructor}
* @returns {google.payments.api.PaymentsClient} Google Pay API client
*/
function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
    paymentsClient = new google.payments.api.PaymentsClient({environment: 'TEST'});
  }
  return paymentsClient;
}
 
/**
* Initialize Google PaymentsClient after Google-hosted JavaScript has loaded
*
* Display a Google Pay payment button after confirmation of the viewer's
* ability to pay.
*/
function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest())
      .then(function(response) {
        if (response.result) {
          addGooglePayButton();
          // @todo prefetch payment data to improve performance after confirming site functionality
           prefetchGooglePaymentData();
        }
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}
 
/**
* Add a Google Pay purchase button alongside an existing checkout button
*
* @see {@link https://developers.google.com/pay/api/web/reference/object#ButtonOptions|Button options}
* @see {@link https://developers.google.com/pay/api/web/guides/brand-guidelines|Google Pay brand guidelines}
*/
function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
      paymentsClient.createButton({onClick: onGooglePaymentButtonClicked, buttonColor:'black', buttonType:'long'});
      document.getElementById('container').appendChild(button);
      document.getElementById('container').style.display = 'block';
}
 
/**
* Provide Google Pay API with a payment amount, currency, and amount status
*
* @see {@link https://developers.google.com/pay/api/web/reference/object#TransactionInfo|TransactionInfo}
* @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
*/
 
function getGoogleTransactionInfo() {
  return {
    currencyCode: $('#currency').val(),
    totalPriceStatus: 'FINAL',
    // set to cart total
    totalPrice: $('#amount').val()
  };
}
 
/**
* g payment data to improve performance
*
* @see {@link https://developers.google.com/pay/api/web/reference/client#prefetchPaymentData|prefetchPaymentData()}
*/
function prefetchGooglePaymentData() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  // transactionInfo must be set but does not affect cache
  paymentDataRequest.transactionInfo = {
    totalPriceStatus: 'NOT_CURRENTLY_KNOWN',
    currencyCode: $('#currency').val()
  };
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.prefetchPaymentData(paymentDataRequest);
}
 
/**
* Show Google Pay payment sheet when Google Pay payment button is clicked
*/
function onGooglePaymentButtonClicked() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
 
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.loadPaymentData(paymentDataRequest)
      .then(function(paymentData) {
        // handle the response
        processPayment(paymentData);
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}
 
/**
* Process payment data returned by the Google Pay API
*
* @param {object} paymentData response from Google Pay API after user approves payment
* @see {@link https://developers.google.com/pay/api/web/reference/object#PaymentData|PaymentData object reference}
*/
function processPayment(paymentData) {
  var data = {
          paymentData : paymentData,
          merchant_id : $('#merchantId').val(),
          amount : $('#amount').val(),
          currency : $('#currency').val(),
          ordernumber : $('#ordernumber').val(),
          email : $('#email').val(),
          firstname : $('#firstname').val(),
          middlename : $('#middlename').val(),
          lastname : $('#lastname').val(),
          comment : $('#comment').val()
      };
// For debug
console.log(data);
 
  $.post("/pay/tokenpay_widget_gp.cfm", JSON.stringify(data)).then(function (result) {
      // For debug
          console.log(result);
          // Example result:
          // {"order":{"ordernumber":"2019.03.11-664","orderstate":"Approved"}}
 
  });
}
</script>
<script async src="https://pay.google.com/gp/p/js/pay.js" onload="onGooglePayLoaded()"></script>

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Key

Description of the widget

Widget installation

Widget installation

Widget customization

Script example