Frontend Capabilities

# Integrate Google Pay

Google Pay is a digital wallet platform and online payment system developed by Google to power in-app, online, and in-person contactless purchases on mobile devices, enabling users to make payments with Android phones, tablets, or watches.

This tutorial guides you on using Chargebee.js to integrate Google Pay on your website and creating a subscription after the user checks out after making a purchase.

# Gateway Prerequisites

Chargebee currently supports the below payment gateways for Google Pay:

# Setting up Chargebee JS

# Inserting chargebee.js script in your application

Include the following script in your HTML page. You need to do this only once per page.

<script src="https://js.chargebee.com/v2/chargebee.js"></script>
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# Initializing a Chargebee instance

Inside your JavaScript code, initialize chargebee with the publishable key (opens new window) once the page is loaded and get 'chargebee instance' object. This object is used further to create components.

Example:

var cbInstance = Chargebee.init({
	site: "site-name", // your test site
	domain: "https://mybilling.acme.com" // this is an optional parameter.
    publishableKey: "test__"
})
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Learn more about ​​initializing a Chargebee instance.

Note:

If you are using a permissions policy, set the permissions-policy header with value payment(*) to complete payments using Google Pay.

# Create a Payment Intent

You should create a payment intent before submitting the form to authorize the payments.

payment_intent performs the essential function of tracking different events involved in a transaction. This includes:

  • Automatically changing its status based on the outcome of authorization and capture events.

  • Automatically refunding in case of an error post-payment.

A payment_intent can be created at your server-side using create a payment intent API (opens new window) and returned to the client side. The payment method handler uses the created payment_intent internally to perform authorization.

Here's the sample code to create a payment_intent.

TIP

This must be done from your backend to avoid exposing sensitive data.

Example:

  • Curl

The above step should be initiated as a request from your front end.

Front end code:

function createPaymentIntent() {
	return fetch('/payment-intents', {
		body: JSON.stringify({
			amount: 500,
			currency_code: 'USD',
			payment_method_type: 'google_pay'
		})
	}).then(function(response) {
		return response.json();
	}).then(function(responseJson) {
		return responseJson.payment_intent;
	});
}
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# Authorize Payment Intent

Follow these steps to integrate Google Pay payments into your website.

# 1. Create a container in DOM to load the Google Pay button

Create a DOM container to hold and display the Google Pay button component.

<div  id='gpay-button'></div>
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# 2. Setup Google Pay

Set up Google Pay on your checkout page using the below steps:

# a. Load Google Pay integration

load Google Pay integration using cbInstance.load("google-pay").

# b. Set payment intent

Pass the payment_intent object to Gpayhandler.setPaymentIntent(payment_intent).

# c. Mount the payment button

Use the gpayHandler.mountPaymentButtonfunction to mount the Google Pay button inside the container element. This function takes the query selector for the container element as an input parameter.

Sample Code:

cbInstance.load('google-pay').then((gpayHandler) => {
  createPaymentIntent().then((intent) => {
      gpayHandler.setPaymentIntent(intent);
      return gpayHandler.mountPaymentButton('#gpay-button')
  }).then(() => {
      // once button mounted
      return gpayHandler.handlePayment();
  }).then((result) => {
      // result.paymentIntent contains authorized payment intent
      // result.paymentData contains card details like last4, brand
  }).catch((error) => {
      // handle error
  });
});
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# 3. Handle Payment

Use the gpayHandler.handlePayment function to initiate the transaction. The handlePayment function resolves to an authorized payment intent once the user authorizes the payment using the Google Pay wallet.

Example for promises and callbacks

Using webhooks

Use webhooks (opens new window) for production use, instead of making the subscription creation request from the client-side, it's more secure and reliable to respond to webhooks from Chargebee on the server-side. Listen to the payment_intent_updated (opens new window) event via webhooks and create the subscription when the payment_intent.status (opens new window) is authorized.

  • Promises
  • Callbacks

Learn more about the additional functions for Google Pay.

# Create a subscription

Pass the ID of the successfully authorized payment_intent to Chargebee’s create a subscription API (opens new window).

  • Curl

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