Google Pay

You can initiate commercial payments on behalf of your merchants using Google Pay in your frontend. Currently, this flow is for web-based platforms only. If you plan to build a mobile app, please mention it to your account manager.

Google Pay commercial payments are settled after 3 days of payment initiation.


Integration can be split in two parts – wallet validation together with payment sheet creation and payment initiation.

  1. When your end-user selects to pay by Google Pay, you will need to load Google Pay API JS Library in your frontend. Sample below:
  onload="console.log('TODO: add onload function')">
  1. After the Google Pay API JavaScript library loads, initialize a PaymentsClient object. In merchantInfo add your merchant name registered in Google and merchant Id received (in non-prod environment it’s any string between 12 and 18 symbols) after production access is approved. In non-prod environment dummy payment methods are returned that are suitable to reference the structure of a payment response. In this environment, a selected payment method isn’t capable of a transaction. Please see sample below:
const paymentsClient =
    new google.payments.api.PaymentsClient({{
  environment: "TEST",
  merchantInfo: {
    merchantName: "Example Merchant",
    merchantId: "12345678901234567890"

Tip! Google recommends to only initialize paymentsClient once. Use the same instance when you invoke all of the other APIs, like CreateButton, IsReadyToPay, PrefetchPaymentData, and LoadPaymentData.

  1. Then, you’ll need to call isReadyToPay() to determine if the Google Pay API is supported by the current device and browser for your specified payment methods. Add your allowed payment methods to your base request object. In tokenizationSpecification add:
"tokenizationSpecification": {
"parameters": {
"gateway": "checkoutltd",
"gatewayMerchantId": "pk_gvvpjipxznauq67fhtegsnao7q#"

  At ConnectPay, we support both VISA and MASTERCARD. See the following code sample:

const baseRequest = {
    apiVersion: 2,
    apiVersionMinor: 0,
const allowedCardNetworks = ['MASTERCARD', 'VISA'];
const allowedCardAuthMethods = ['PAN_ONLY','CRYPTOGRAM_3DS'];
const baseCardPaymentMethod = {
    type: 'CARD',
    parameters: {
      allowedAuthMethods: allowedCardAuthMethods,
      allowedCardNetworks: allowedCardNetworks,
      assuranceDetailsRequired: true,
    tokenizationSpecification: {
    parameters: {
      gateway: example,
      gatewayMerchantId: exampleGatewayMerchantId

const isReadyToPayRequest = Object.assign({}, baseRequest);isReadyToPayRequest.allowedPaymentMethods = [baseCardPaymentMethod];

    .then(function(response) {
      if (response.result) {
        // add a Google Pay payment button
    .catch(function(err) {
      // show error in developer console for debugging
  1. Add a Google Pay payment button to your page. For more information about available button types, colors, and display requirements, see Google Brand guidelines. Google is strict for following their guidelines, please pay attention to it. Incorrect interpretation for branding might cause top up feature restrictions.
  2. Then PaymentDataRequest should be created. To create a PaymentDataRequest object, complete the following steps:
  • Build a JavaScript object that describes your site’s support for the Google Pay API. For a full list of supported properties, see PaymentDataRequest structure at Google documentation. You can decide whether you use both authMethods or only one. We recommend you to support both to suggest this feature for more users.
    PAN_ONLY: This authentication method is associated with payment cards stored on file with the user’s Google Account. Returned payment data includes personal account number (PAN) with the expiration month and the expiration year. This method forces 3DS authorization which we support.
    CRYPTOGRAM_3DS: This authentication method is associated with cards stored as Android device tokens. Returned payment data includes a 3-D Secure (3DS) cryptogram generated on the device.
    See the following code sample:
const paymentDataRequest = Object.assign({}, baseRequest);
  • Add the payment methods supported by your app, such as any configuration of additional data that’s expected in the response. See the following code sample:
paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  • Define a total price and currency for a shopper to authorize. You must include the countryCodetotalPrice, and merchantName parameters to meet SCA requirements. See the following code sample:
paymentDataRequest.transactionInfo = {
  totalPriceStatus: 'FINAL',
  totalPrice: '123.45',
  currencyCode: 'EUR',
  countryCode: 'LT'
  • Provide a user-visible merchant name, and use Google TEST merchantId value when in TEST environment. See the following code sample of a user-visible merchant name:
paymentDataRequest.merchantInfo = {
  merchantName: 'Example Merchant'
  merchantId: '12345678901234567890'
  1. Then payment sheet initialization should start. To register an event handler for user gestures, complete the following steps:
  • Register a click event handler for the purchase button. The event handler calls loadPaymentData() immediately after it interacts with the Google Pay, payment button.
  • After a Google user grants permission for your site to receive information about the user’s selected form of payment and optional contact data, handle the response from the Google Pay API.
  • Extract the payment token from the paymentData response. You will be using gateway integration, pass this token to our Initiate Google Pay API without any modifications.

Note! In a TEST environment, a payment response includes summary data about the selected payment method that’s suitable for display on a confirmation page. The payment response doesn’t include a payment method that’s capable of a transaction.

  // if using gateway tokenization, pass this token without modification
  paymentToken = paymentData.paymentMethodData.tokenizationData.token;
  // show error in developer console for debugging

  1. When you send us Initiate Google Pay API request and there is CRYPTOGRAM_3DS selected as authMethod a process is shorter. As Google takes liability shift here, end-user authorizes a payment in Android device using biometrics, everything happens on the same page and after we receive payment status update, we send you a notification about payment status change. Initiate Google Pay API returns payment ID as response which you can map with payment status change notification response. More about notifications can be found here.
  2. Notifications are optional, so if you don’t want to receive them, you can always call our Get payment details API to receive status on your own.
  3. After status is successful, you will need to show your end-user result page specifically mentioning that this payment was initiated by Google Pay method.
  1. When you send us Initiate Google Pay API request and there is PAN_ONLY selected as authMethod, you will receive redirectUrl in response. Redirect your end-user to that URL, there they will perform 3DS authorization.
  2. After 3DS authorization, based on result we will redirect your user back at successUrl or failureUrl provided by you in Initiate Google Pay API request. For security reasons those URLs should be saved to your devApp too.
  3. After redirection, process is same as with CRYPTOGRAM_3DS flow – we can send you status change notifications or else you can call our Get payment details API instead.

Splitting one payment for multiple

Access token and brand information

Single payments

Payment details


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