Google Pay™

Google Pay™ offers the convenience of using cards stored in your Google Account, delivering a fast and secure payment solution across websites, apps, and in-store purchases. PayEngine currently supports all major card brands—Visa, MasterCard, American Express, and Discover—in the US and Canada for Google Pay™ transactions.

Note: By integrating Google Pay, you agree to Google’s terms of service and Google Pay™ API's Acceptable Use Policy

Enabling Google Pay™ for your account

Please contact your support representative to enable Google Pay™ for your account.

Using Google Pay™ in your Web Application

For native app integration, please contact your assigned solution engineer for further implementation details. Also review Google Pay Android developer documentation, Google Pay Android integration checklist and Google Pay Android brand guidelines.

This platform makes it easy to present Google Pay™ during the checkout process in your web application. If you're already using the JS library, it's as simple as calling an extra function to present Google Pay™ button.

To learn more about the JS library, please see our guide.

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Google Pay Demo</title>
    <script src="https://console.payengine.co/js/1.0.0/embed.js?key=<your public key>" async></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/axios/0.22.0/axios.min.js"
    integrity="sha512-m2ssMAtdCEYGWXQ8hXVG4Q39uKYtbfaJL5QMTbhl2kc6vYyubrKHhr6aLLXW4ITeXSywQLn1AhsAaqrJl8Acfg=="
    crossorigin="anonymous" referrerpolicy="no-referrer"></script>
</head>

<body>
  <h4>Google Pay</h4>
  <div id="button"></div>
  <script>
    const merchantId = "<Your Merchant ID>";
    const amount = <Amount you want to charge>;
      const submit = (token) => {
        axios
          .post(
            "<Your Back End Application>/api/charge",
            {
              merchantID: merchantId,
              token: token,
              amount: String(amount),
            }
          )
          .then((resp) => {
            //Handle Response from your backend
          })
          .catch((err) => {
            //Handle Error from your backend
          });
      };
    window.onload = () => {
      PayEngine.GooglePay.configure({
        merchantId: merchantId,
        hmac:<Your HMAC>,
        amount: amount,
        selector: "#button",
        buttonType: "pay", 
        buttonColor: 'black',
         callback: function (response, error) {
            if (!error) {
              //Handle Success here. Typically call your backend to call PayEngine ccsale API
              submit(response.token);
            } else {
              //Handle Google Pay Authorization Error
            }
          },
      });
    };
  </script>
</body>

</html>

// Credit Card Sale
// Note that this call is not changed and can pass in Google Pay Token just like Credit card tokens
exports.charge = async function (req, res) {
    try{
        const response = await axios.post(PayEngine_Server + "/api/payment/sale",
            {
                "merchant_id": req.body.merchantID,
                "data": {
                    "transactionAmount": req.body.amount,
                    "cardToken": req.body.token,
                    "currencyCode": "USD"
                }
            },
            {
                headers: {
                    'Content-type': 'application/json',
                    'Accept': 'text/plain',
                    'Authorization': 'Basic ' + secret_key
                }
            })
        res.json(response.data)
    }catch(error){
        res.json({error: error.response?.data ?? error})
    }
}

Presenting the Google Pay™ button

As shown in the example above, in your client app you just call GooglePay.configure function to present Google Pay™ as an option. Please note that you need to have provide the amount before you call this method.

PayEngine.GooglePay.configure({
  merchantId: <Your Merchant ID>,
  hmac:<Your HMAC>,
  amount: <Amount You want to charge>,
  selector: "#button",
  buttonType: "pay", 
  buttonColor: "default", 
  billingAddressRequired: true,
  shippingAddressRequired: true,
  callback: function (response, error) {
    if (!error) {
      //Call Your backend server to execute PayEngine sale API
    } else {
      // Handle error here  
    }
  },
});

To request billing and/or shipping address set the billingAddressRequired and shippingAddressRequired properties to true. You can also include extra billing and shipping address parameters if default response is not sufficient. Please see Google Pay documentation here

Sample Token Response with metadata

{
    "token": "pe_sandbox_***************",
    "metadata": {
        "shippingAddress": {
            "address3": "",
            "sortingCode": "",
            "address2": "",
            "countryCode": "US",
            "address1": "123 Main Street",
            "postalCode": "90245",
            "name": "John Doe",
            "locality": "Los Ageles",
            "administrativeArea": "CA"
        },
        "billingAddress": {
            "address3": "",
            "sortingCode": "",
            "address2": "",
            "countryCode": "US",
            "address1": "123 Main Street",
            "postalCode": "90245",
            "name": "John Doe",
            "locality": "Los Angeles",
            "administrativeArea": "CA"
        }
    },
    "merchantId": "<Your Merchant ID>"
}

Customizing Google Pay™ button

You can customize the label and color of your Google Pay™ Button by providing buttonType and buttonColor attributes in Google Pay™ configuration object.

  buttonType: 'pay', // "book" | "buy" | "checkout" | "donate" | "order" | "pay" | "plain" | "subscribe" | "long" | "short"
  buttonColor: 'default', // "default" | "black" | "white"

In addition, you can control the sizing of the button by enclosing it in another element (typically a div) with specific width and height attributes.

Dynamic Pricing Setup with Google Pay

Overview

This document outlines the setup for dynamic pricing using Google Pay, including how to configure shipping options, handle payment data changes, and calculate transaction information based on selected shipping options.

Setup Shipping Options

Shipping options define the available delivery methods for customers. Each option includes an ID, label, and description.

const shippingOptions = [
    {
        "id": "shipping-001",
        "label": "$0.00: Free shipping",
        "description": "Free Shipping delivered in 5 business days."
    },
    {
        "id": "shipping-002",
        "label": "$1.99: Standard shipping",
        "description": "Standard shipping delivered in 3 business days."
    },
    {
        "id": "shipping-003",
        "label": "$2.99: Express shipping",
        "description": "Express shipping delivered in 1 business day."
    }
]

id: A unique identifier for each shipping option.
label: The display text shown to the user.
description: Additional information about the shipping method.

Setup Shipping Parameters and Handle Callback

This section configures the Google Pay API with the necessary parameters, including shipping address requirements and options.

PayEngine.GooglePay.configure({
    ...parameters,
    shippingAddressRequired: true,
    shippingAddressParameters: {
        phoneNumberRequired: false
    },
    shippingOptionRequired: true,
    shippingOptionParameters: {
        defaultSelectedOptionId: shippingOptions[0].id,
        shippingOptions: shippingOptions
    },
    onPaymentDataChanged: onPaymentDataChanged
})

shippingAddressRequired: Indicates if the shipping address is mandatory.
shippingAddressParameters: Configuration for the shipping address, including whether the phone number is required.
shippingOptionRequired: Indicates if a shipping option must be selected.
shippingOptionParameters: Sets the default selected shipping option and provides the list of available options.
onPaymentDataChanged: A callback function that handles changes in payment data.

Sample of onPaymentDataChanged Handler

The onPaymentDataChanged function processes updates to the payment data based on user interactions, such as selecting a shipping option or entering a shipping address.

var calculateTransactionInfo = (shippingOptionData) => {
    var shippingOptionId = shippingOptionData.id
    var shippingFee = shippingOptionId === 'shipping-001' ? 0 : shippingOptionId === 'shipping-002' ? 1.99 : 2.99
    return {
        displayItems: [
            {
                label: "Subtotal",
                type: "SUBTOTAL",
                price: amount.toString(),
            },
            {
                label: "Shipping Fee",
                type: "LINE_ITEM",
                price: shippingFee.toString(),
            }
        ],
        currencyCode: "USD",
        totalPriceStatus: "FINAL",
        totalPrice: (amount + shippingFee).toString(),
        totalPriceLabel: "Total"
    }
}

const onPaymentDataChanged = async (intermediatePaymentData) => {
    const { callbackTrigger, shippingAddress, shippingOptionData } = intermediatePaymentData

    // return empty object if no update
    let paymentDataRequestUpdate = {}

    // update transaction info
    // simulate server call to calculate dynamic pricing
    await new Promise(resolve => setTimeout(resolve, 2000))

    if (callbackTrigger == "INITIALIZE" || callbackTrigger == "SHIPPING_ADDRESS") {
        if(shippingAddress.countryCode == "JP")  {
            paymentDataRequestUpdate.error = {
                reason: 'SHIPPING_ADDRESS_NOT_SUPPORTED',
                message: 'We do not offer shipping to your selected shipping address',
                intent: 'SHIPPING_ADDRESS'
            }
        }
        else {
            const selectedShippingOption = shippingOptions[1]
            paymentDataRequestUpdate.newShippingOptionParameters = {
                defaultSelectedOptionId: selectedShippingOption.id,
                shippingOptions: shippingOptions
            }
            paymentDataRequestUpdate.newTransactionInfo = calculateTransactionInfo(selectedShippingOption)
        }
    }
    else if (callbackTrigger == "SHIPPING_OPTION") {
        paymentDataRequestUpdate.newTransactionInfo = calculateTransactionInfo(shippingOptionData)
    }

    return paymentDataRequestUpdate
}

calculateTransactionInfo: A function that calculates the transaction details based on the selected shipping option, including subtotal, shipping fee, and total price.
onPaymentDataChanged: This function handles different callback triggers:
- INITIALIZE: When the payment process starts.
- SHIPPING_ADDRESS: When the user updates their shipping address.
- SHIPPING_OPTION: When the user selects a different shipping option.

This setup allows for a flexible and dynamic pricing model using Google Pay, enhancing the user experience by providing real-time updates based on shipping selections. For more detailed please refer to the official Google Pay API docs https://developers.google.com/pay/api/web/reference/client#onPaymentDataChanged

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