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1. Enter REST API credentials in api/Config/Config.php. You can get your own REST app credentials by creating a REST app with the steps outlined here .
2. Click on 'PayPal Checkout’ button and see the experience.
3. If you get any Firewall warning, add rule to the Firewall to allow incoming connections for your application.
4. Checkout with PayPal using a buyer sandbox account provided on this page. And you're done!

In-Context Checkout integration steps with Checkout.js v4

1. Copy the files and folders in the package to the same location where you have your shopping cart page.
2. Include the following Checkout.js v4 script on your shopping cart page:

   paypal.Button.render({
       env: 'sandbox', // sandbox | production
   
       // Show the buyer a 'Pay Now' button in the checkout flow
       commit: true,
   
       // payment() is called when the button is clicked
       payment: function() {
   
           // Set up a url on your server to create the payment
           var CREATE_URL = 'api/createPayment';
   
           // Make a call to your server to set up the payment
           return paypal.request.post(CREATE_URL)
               .then(function(res) {
                   return res.paymentID;
               });
       },
   
       // onAuthorize() is called when the buyer approves the payment
       onAuthorize: function(data, actions) {
   
           // Set up a url on your server to execute the payment
           var EXECUTE_URL = 'api/executePayment';
   
           // Set up the data you need to pass to your server
           var data = {
               paymentID: data.paymentID,
               payerID: data.payerID
           };
   
           // Make a call to your server to execute the payment
           return paypal.request.post(EXECUTE_URL, data)
               .then(function (res) {
                   window.alert('Payment Complete!');
               });
       }
   }, '#paypal-button-container');
               

3. Open your browser and navigate to your Shopping cart page. Click on 'Checkout with PayPal' button and complete the flow.
4. You can use the sample Buyer Sandbox credentials provided on index.php/home page.
5. Read overview of REST API here and find the API reference here. You can also try the interactive demo here