# Google Pay™ on Web

Accept Google Pay™ on your website using Finix.

This guide details how to get started accepting Google Pay on web.

Start by familiarizing yourself with [the prerequisites](/guides/online-payments/digital-wallets/google-pay) for using Google Pay™ with Finix.

Dues and Assessments
We recommend that you pass the address field listed in the steps below. If the address is not passed, you will be charged additional dues and assessments per transaction from the card network.

## Step 1: Add the Google Pay Library

First, load the Google Pay API JavaScript library into your app. You can add the Google Pay library by following these steps:

1. Include the JavaScript script below in your website to add Google Pay's JavaScript Library so your website can make calls to Google Pay’s API.



```javascript Google Pay JS Script
<script async src="https://pay.google.com/gp/p/js/pay.js" onload="onGooglePayLoaded()">
 function onGooglePayLoaded() {
   window.googlePayClient = new google.payments.api.PaymentsClient({
     environment: "TEST"
   });
 }
</script>
```

1. Once you've added the code and the library loads, create a `PaymentsClient` object.
  1. For a sandbox environment, use `environment: "TEST"`. This returns test payment methods that can be used for sandbox transactions.
  2. For a live environment, use `environment: "LIVE"`.



```javascript Google Pay PaymentsClient Object
const paymentsClient = new google.payments.api.PaymentsClient({
    environment: "TEST",
});
```

## Step 2: Define Google Pay API Version

After you've added the Google Pay API JavaScript library, declare the version of the Google Pay API that your site uses. The major and minor versions are required in the fields of each passed object and are included in the response. The following code sample shows the declared API versions.


```javascript Google Pay API Version
const baseRequest = {
    apiVersion: 2,
    apiVersionMinor: 0,
};
```

## Step 3: Request a Finix Payment Token

Now that you've defined your Google Pay API Version, request a Finix payment token.


```javascript Google Pay Tokenization Specification
const tokenizationSpecification = {
    type: "PAYMENT_GATEWAY",
    parameters: {
        gateway: "finix",
        gatewayMerchantId: "IDxxx",
    },
};
```

## Step 4: Define Allowed Card Networks

Now that we've requested a Finix payment token, you can set which card networks will be accepted on your site by:

- Defining `allowedCardNetworks`.
- Defining `allowedCardAuthMethods` which sets the authentication methods supported by your site and gateway.



```javascript Google Pay Allowed Card Networks
const allowedCardNetworks = [
    "AMEX",
    "DISCOVER",
    "INTERAC",
    "JCB",
    "MASTERCARD",
    "VISA",
];
const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];
```

For both `PAN_ONLY` and `CRYPTOGRAM_3DS` authorization methods, support for 3D Secure is dictated by the processors you integrate with in `allowedCardNetworks`. Finix accepts both `PAN_ONLY` and `CRYPTOGRAM_3DS` authorization methods.

## Step 5: Describe Allowed Payment Methods

After you've defined the supported payment card networks, you need to describe your allowed payment methods. You can do this with the following steps:

1. Combine `allowedAuthMethods` and `allowedCardNetworks` to describe how your site supports the `CARD` payment method.
2. Extend the `baseCardPaymentMethod` object and describe the information you expect to be returned to your application. Include a description of the tokenized payment data.



```javascript Google Pay Payment Methods
const baseCardPaymentMethod = {
    type: "CARD",
    parameters: {
        allowedAuthMethods: allowedCardAuthMethods,
        allowedCardNetworks: allowedCardNetworks,
    },
};
const cardPaymentMethod = Object.assign(
    { tokenizationSpecification: tokenizationSpecification },
    baseCardPaymentMethod
);
```

## Step 6: Check Readiness to Pay with Google Pay

Now that you've described your allowed payment methods, you need to check readiness to pay with the Google Pay API. To check readiness to pay with Google Pay's API:

1. Add `allowedPaymentMethods` to the `baseRequest` object.
2. Call `isReadyToPay()` to see if Google Pay's API is supported by the current device and browser for the payment methods specified.



```javascript Google Pay Readiness Check
const isReadyToPayRequest = Object.assign({}, baseRequest);
isReadyToPayRequest.allowedPaymentMethods = [baseCardPaymentMethod];

paymentsClient
    .isReadyToPay(isReadyToPayRequest)
    .then(function (response) {
        if (response.result) {
            // add a Google Pay payment button
        }
    })
    .catch(function (err) {
        // show error in developer console for debugging
        console.error(err);
    });
```

## Step 7: Add the Google Pay Button

Now that you've checked readiness to pay with Google Pay API, you can add a Google Pay payment button to your website.

- For information about the different button types and display requirements, see [Google's Brand guidelines](https://developers.google.com/pay/api/web/guides/brand-guidelines).
- To try all the different Google Pay buttons, see [Google Pay's interactive demo](https://developers.google.com/pay/api/web/guides/resources/customize).


JavaScript

```javascript Google Pay Button – JS Example
const button = paymentsClient.createButton({
    onClick: () => console.log("TODO: click handler"),
    allowedPaymentMethods: [],
}); // make sure to provide an allowed payment method
document.getElementById("container").appendChild(button);
```

HTML

```html Google Pay Button – HTML Example
<google-pay-button
    environment="TEST"
    button-color="default"
    button-type="subscribe"
></google-pay-button>
```

#### CSS Properties

| Field | Type | Description |
|  --- | --- | --- |
| `button-color` | String, optional | Color of the button. Available values are **default**, **black**, and **white** |
| `button-type` | String, optional | Available values are **black**, **white**, and **white-outline** |
| `button-locale` | String, required | Set the language of the button. There's a variety of buttons that you can use on your website to begin the transaction. This includes: book, buy, checkout, donate, order, pay, plain, and subscribe. |


## Step 8: Create a Payment Data Request

After creating a Google Pay payment button, you need to create a `PaymentDataRequest` object. Follow these steps:

1. Build a JavaScript object that describes your site's support for the Google Pay API. See the `PaymentDataRequest` object for a list of supported properties.



```javascript paymentDataRequest
const paymentDataRequest = Object.assign({}, baseRequest);
paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
paymentDataRequest.transactionInfo = {
  countryCode: 'US',
  currencyCode: 'USD',
  totalPrice: '123.45',
  totalPriceStatus: 'FINAL'
};
paymentDataRequest.merchantInfo = {
  merchantId: '12345678901234567890'
  merchantName: 'Example Merchant'
};
```

#### `transactionInfo` Request Arguments

| Field | Type | Description |
|  --- | --- | --- |
| `countryCode` | *string*, **required** | The ISO country code. |
| `currencyCode` | *string*, **required** | The currency code of the locale. |
| `totalPrice` | *string*, **required** | Total value of the transaction with an optional decimal precision of two decimal places. |
| `totalPriceStatus` | *string*, **required** | The status of the total price used. Pass **FINAL** if the total price doesn't change from the amount presented to the buyer.Pass **ESTIMATED** if the total price might adjust based on the details of the response, such as sales tax collected that's based on a billing address.Pass **NOT_CURRENTLY_KNOWN** when using `totalPriceStatus` for a capability check. |


#### `merchantInfo` Request Arguments

| Field | Type | Description |
|  --- | --- | --- |
| `merchantID` | *string*, **required** | A Google merchant identifier issued after registration with the Google Pay Business Console. Required when PaymentsClient is initialized with an environment property of **LIVE** |
| `merchantName` | *string*, **required** | Pass in the name of the `Merchant` . |


1. Add the payment methods supported by your site and any configurations of additional data that are expected in the response.
2. Set a `totalPrice` and `currencyCode` for the buyer to authorize.
3. Provide a user-visible `merchantName`.
  - Use the `TEST` `Merchant` ID if you're in a sandbox environment.


Strong Customer Authentication (SCA)
Merchants that process transactions in the European Economic Area (EEA) or any other countries that are subject to Strong Customer Authentication (SCA) must include the `countryCode`, `totalPrice`, and `merchantName` parameters to meet SCA requirements.

## Step 9: Create a Payment

After calling loadPaymentData using the Google Pay payments client object, a token will be returned in that response.


```javascript paymentsClient paymentToken
paymentsClient
    .loadPaymentData(paymentDataRequest)
    .then(function (paymentData) {
        // if using gateway tokenization, pass this token without modification
        paymentToken = paymentData.paymentMethodData.tokenizationData.token;
        // for billing details
        name = paymentData.paymentMethodData.info.billingAddress.name;
        address = {
            postal_code:
                paymentData.paymentMethodData.info.billingAddress.postalCode,
            country:
                paymentData.paymentMethodData.info.billingAddress.countryCode,
        };
    })
    .catch(function (err) {
        // show error in developer console for debugging
        console.error(err);
    });
```

Pass the `third_party_token`, `address`, and `name` when creating a [`Payment Instrument`](/api/payment-instruments/createpaymentinstrument).


```shell Payment Instrument Request
curl https://finix.sandbox-payments-api.com/payment_instruments \
    -H 'Content-Type: application/json' \
    -H 'Finix-Version: 2022-02-01' \
    -u  USsRhsHYZGBPnQw8CByJyEQW:8a14c2f9-d94b-4c72-8f5c-a62908e5b30e \
    -d '{
        "identity": "ID78Fh8mcnnzukVzbdoyex5y",
        "merchant_identity": "IDwhCCvPwCDEmiFd8Be7pDzN",
        "name": "Finix Sandbox",
        "third_party_token": "{\"signature\":\"MEYCIQCYTkaEMgug7pcjzEEdbIn+R57kYO5yYc2KYj41AQQn9wIhAN1QvylvZ2XydVecfejwi2xYS9y3Y9y/MmDnRnUfNw5H\",\"intermediateSigningKey\":{\"signedKey\":\"{\\\"keyValue\\\":\\\"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE4xc3fjeM9SMTjd1TL2GQCPmgqPf2h42aM3akPh/mTUBqWEgOITruK10A02rQ+4YZOvLCpQKQZzLSAd09nctnuA\\\\u003d\\\\u003d\\\",\\\"keyExpiration\\\":\\\"1648843199734\\\"}\",\"signatures\":[\"MEQCICwCI4s5YCLu4qRCyXwSJ3qG8y3ocFtP1Mque4Uzysl8AiARoD/0qbj5W0Q2PWKpxkEnfcP+nU5kwYS8FyQ9boDTmQ\\u003d\\u003d\"]},\"protocolVersion\":\"ECv2\",\"signedMessage\":\"{\\\"encryptedMessage\\\":\\\"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\\\\u003d\\\",\\\"ephemeralPublicKey\\\":\\\"BMqIyb1IyXhuZ4YpWm1PiRr74i3tCwDfQqJ1P4OZ3zK4Rq16SuwgJ605fCEvlViwSQuo2Hpv+CcR+2D3+/YrLB8\\\\u003d\\\",\\\"tag\\\":\\\"5K4LlTucDK7jAThbIozYtyoxX95hRNd5cJJGfxWAxw8\\\\u003d\\\"}\"}",
        "type": "GOOGLE_PAY",
        "address": {
            "country": "USA",
            "postal_code": 12345
        }
    }'
```


```json Payment Instrument
{
    "id": "PIf8dyFFcEGBqPhaG22hPyYs",
    "created_at": "2022-10-10T05:36:55.27Z",
    "updated_at": "2022-10-10T05:36:55.27Z",
    "address": {
        "city": null,
        "country": "USA",
        "line1": null,
        "line2": null,
        "postal_code": 12345,
        "region": null
    },
    "application": "APeUfzF5qdNkBCtdgcf3333n",
    "created_via": "API",
    "currency": "USD",
    "enabled": true,
    "fingerprint": "FPRrcobjtdU98gr4sjiqYR1Qg",
    "identity": "ID78Fh8mcnnzukVzbdoyex5y",
    "instrument_type": "GOOGLE_PAY",
    "bin": "411111",
    "brand": "VISA",
    "card_type": "UNKNOWN",
    "expiration_month": 12,
    "expiration_year": 2027,
    "issuer_country": "UNKNOWN",
    "last_four": "1111",
    "name": "Finix Sandbox",
    "tags": {},
    "type": "GOOGLE_PAY",
    "_links": {
        "self": {
            "href": "https://finix.sandbox-payments-api.com/payment_instruments/PIf8dyFFcEGBqPhaG22hPyYs"
        },
        "authorizations": {
            "href": "https://finix.sandbox-payments-api.com/payment_instruments/PIf8dyFFcEGBqPhaG22hPyYs/authorizations"
        },
        "transfers": {
            "href": "https://finix.sandbox-payments-api.com/payment_instruments/PIf8dyFFcEGBqPhaG22hPyYs/transfers"
        },
        "verifications": {
            "href": "https://finix.sandbox-payments-api.com/payment_instruments/PIf8dyFFcEGBqPhaG22hPyYs/verifications"
        },
        "application": {
            "href": "https://finix.sandbox-payments-api.com/applications/APeUfzF5qdNkBCtdgcf3333n"
        },
        "identity": {
            "href": "https://finix.sandbox-payments-api.com/identities/ID78Fh8mcnnzukVzbdoyex5y"
        }
    }
}
```

For security purposes, [Google Pay tokens](https://support.google.com/pay/merchants/answer/6345242?hl=en#) are only active for a short period of time.

Due to this limited lifetime, the `third_party_token` used in the request above has expired. To test the request, use your `third_party_token` and Finix credentials.

Once complete, similar to other Finix transactions, you can create a [`transfer`](/api/transfers) or an [`authorization`](/api/authorizations/createauthorization).