It is possible to use Google Pay on the web without our SDK. To learn how to integrate Google Pay we recommend following Google’s tutorial. The steps below will highlight any differences and specifics for our API.

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About this integration

Even without Embed, there is only minimal configuration required to get set up to process Google Pay. There is no need to sign up for a Google Developer account with this integration.
For Android apps which use this option with WebViews, please note that platform specific Android Google Pay APIs must be invoked. Please refer to Google’s FAQ for more information.

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Enable Google Pay

To enable Google Pay, head over to your dashboard and then go to Connections -> Catalog -> Google Pay. Next, fill in your merchant name and the domain name(s) where you want to use Google Pay. Google Pay connector setup

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Integrate Google Pay

The following steps highlight the integration points with our system using Google’s tutorial for Google Pay.

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Fetch a Google Pay session

First, before you can render a Google Pay button, you will need to call our API to get a token and your Gr4vy gateway ID. Call the POST /digital-wallets/google/session API with the domain you want to host Google Pay on. This needs to be the full domain including any subdomains like www.. 
{ "origin_domain": "www.example.com" }
This will return your gateway merchant ID as well as a JWT that authorized Gr4vy to run on your domain. 
{
  "gateway_merchant_id": "app.gr4vy.sandbox.example.default",
  "token": "eyJhbGciOiJFUzI1NiIsInR5cCI....NwRL9ZZg0N--ZyP6I0dDfHHoWhVkrHpQ"
}

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Set gateway and merchant ID

Next, in step 2 of Google’s tutorial you are instructed to request a payment token for your provider. In our case, the value for gateway needs to be set to gr4vy, and the value of gatewayMerchantId needs to be set to the value you received from our session API in the previous step. 
const tokenizationSpecification = {
  type: "PAYMENT_GATEWAY",
  parameters: {
    gateway: "gr4vy",
    gatewayMerchantId: "app.gr4vy.sandbox.example.default",
  },
};
The Gr4vy ID is the unique identifier for your instance. Together with the environment (sandbox or production) it is used to connect to the right APIs.

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Set the merchant info

Next, in step 8, you will need to set a merchantInfo object. This authorized Gr4vy to accept Google Pay on your domain. When setting the merchantInfo object, make sure to set the token returned from our session API, your merchant name, our Gr4vy merchant ID, and the full domain you passed to our session API (including any subdomains like www.) 
const merchantInfo = {
  authJwt: "eyJhbGciOiJFUzI1NiIsInR5cCI....NwRL9ZZg0N--ZyP6I0dDfHHoWhVkrHpQ",
  merchantId: "BCR2DN4T7C3KX6DY", // This identifies Gr4vy
  merchantName: "Example App",
  merchantOrigin: "www.example.com",
};
OR_BIBED_11 / OR_BIBED_6 - If you were to encounter any kind of OR_BIBED error you likely did not pass the right domain to our API, or you did not pass the same domain to our session API and the merchantInfo object.

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Create a transaction

In step 10 of Google’s tutorial, within the onPaymentAuthorized function you will have a paymentData that needs to be sent to the gateway. You can send this object to our POST /transactions endpoint either directly or via your server. The payment method used needs to contain the data from the Google Pay payload. 
{
  "amount": 1299,
  "currency": "AUD",
  "country": "AU",
  "payment_method": {
    "method": "googlepay",
    "token": "[paymentData.paymentMethodData.tokenizationData.token]",
    "card_suffix": "[paymentData.paymentMethodData.info.cardDetails]",
    "card_scheme": "[paymentData.paymentMethodData.info.cardNetwork]",
    "redirect_url": "https://example.com/callback"
  }
}
We strongly recommend always providing a redirect_url, just in case any connection is configured to use 3-D Secure. This URL will be appended with both a transaction ID and status (e.g. https://example.com/callback?transaction_id=123 &transaction_status=capture_succeeded) after 3-D Secure has been completed.

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Test Google Pay

To test Google Pay visit the site that has your integration loaded on it. Please follow the Google Pay documentation with further guides on how to add test cards for use in a sandbox environment.