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Dharan Ganesan
Dharan Ganesan

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Day 86: Payments API

What is the Web Payments API?

The Web Payments API is a browser standard designed to simplify and secure online payments. It enables developers to create a smoother checkout experience by allowing users to pay with stored payment methods and facilitating a consistent, user-friendly interface.

Basic Concepts:

Before diving into code, let's understand some key concepts:

  • Payment Request: The core of the API, representing the payment information requested from the user.
  • Payment Method: The way a user pays, such as credit card or digital wallet.
  • Payment Handler: The entity that processes payments, like a payment service provider.


Requesting Payment 💳

To initiate a payment, you need to create a PaymentRequest object. This object defines the payment details, such as supported payment methods and details about the transaction.

const supportedPaymentMethods = [
        supportedMethods: 'basic-card',
        data: {
            supportedNetworks: ['visa', 'mastercard'],

const paymentDetails = {
    total: {
        label: 'Total Amount',
        amount: { currency: 'USD', value: '10.00' },
    displayItems: [
      label: 'Product 1',
      amount: { currency: 'USD', value: '10.00' },
    // Add more items

const paymentRequest = new PaymentRequest(supportedPaymentMethods, paymentDetails);
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Handling Payment Response ✨

Once the user approves the payment, a promise is returned with the payment details.

function processPayment(response) {
  // Process the payment details (e.g., send to server)
  // Show a success message to the user

function handlePaymentError(error) {
  // Handle errors (e.g., show an error message)

document.getElementById('buyButton').addEventListener('click', () => {

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  1. Fallback Mechanism: Always provide a fallback mechanism for browsers that do not support the Web Payments API. This ensures a consistent user experience.

  2. Security Considerations: When dealing with payment information, prioritize security. Use HTTPS to encrypt the communication between the user's device and your server.

  3. User Experience: Design the payment flow to be intuitive and user-friendly. Clear instructions and feedback during the payment process enhance user confidence.


E-commerce Platforms 🛍️

E-commerce websites can leverage the Web Payments API to streamline the checkout process. By supporting various payment methods, including credit cards and digital wallets, you enhance user convenience.

Subscription Services 🔄

Subscription-based services can implement the Web Payments API for recurring payments. This simplifies the process for users who want to subscribe to monthly or yearly plans.

Donations and Crowdfunding 💸

Platforms that rely on user contributions can use the Web Payments API to make the donation process smoother. Supporting a variety of payment methods encourages more users to contribute.

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