Integrating third-party payment gateways like Stripe and PayPal is essential for processing payments in a real-world payment app. These payment gateways provide APIs that allow businesses to securely handle payment transactions with various payment methods.

To integrate Stripe as a payment gateway in our Payment App, we can use the stripe library, which provides a convenient way to interact with Stripe's APIs.

First, we need to install the stripe library by running the following command:

1npm install stripe

Once installed, we can initialize the Stripe client by passing our Stripe secret key:

1const stripe = require('stripe')('YOUR_STRIPE_SECRET_KEY');

Next, we can use the Stripe client to perform various operations, such as creating a payment intent:

1const paymentIntent = await stripe.paymentIntents.create({
2  amount: 1000, // Amount in cents
3  currency: 'usd', // Currency code
4});

We can also retrieve a payment intent using its ID:

1const retrievedPaymentIntent = await stripe.paymentIntents.retrieve('PAYMENT_INTENT_ID');
2console.log(retrievedPaymentIntent);

Integrating PayPal as a payment gateway follows a similar process. The PayPal SDK provides methods for creating payments, managing subscriptions, and handling transactions.

By integrating these payment gateways, our Payment App will be able to securely process payments from customers using credit cards, debit cards, and other supported payment methods.

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const stripe = require('stripe')('YOUR_STRIPE_SECRET_KEY');

​

// Create a Payment Intent

const paymentIntent = await stripe.paymentIntents.create({

  amount: 1000,

  currency: 'usd',

});

​

// Retrieve Payment Intent

const retrievedPaymentIntent = await stripe.paymentIntents.retrieve('PAYMENT_INTENT_ID');

​

console.log(retrievedPaymentIntent);