Integrate paypal API with microservice architecture

we’ll walk you through how to integrate PayPal API with a microservice architecture to enable seamless payment processing on your eCommerce website. By leveraging PayPal’s powerful payment solutions and a microservice approach, you can build a scalable, efficient, and secure payment system for your online store

What is paypal?

PayPal is a payment platform with a website and a phone app that enables payments through online money transfers. PayPal customers create an account and connect it to a checking account, a credit card, or both.Once identification and payment method are confirmed, users can send or receive payments online or make purchases using PayPal as the go-between. Millions of small and large retailers accept PayPal payments online and in person

Architecture:

Paypal checkout API:

• source code

 Use:"https://www.paypalobjects.com/api/checkout.js"

 paypal.Button.render({
    	  env: 'sandbox', // sandbox | production
    	    client: {
    	      sandbox:    'xxxxxxxxxx',
    	      production: 'xxxxxxxxxx'
    	    },
    	  // Show the buyer a 'Pay Now' button in the checkout flow
    	  commit: true,
    	  // payment() is called when the button is clicked
    	  payment: function(data, actions) {
    	    // Make a call to the REST API to set up the payment
    	    return actions.payment.create({
    	      payment: {
    	        transactions: [
    	          {
    	            amount: { total:document.getElementById("total-hidden-charges").value, currency: 'USD' }        
    	          }
    	        ],
    	        redirect_urls: {
    	          return_url: 'http://localhost:8090/index',
    	          cancel_url: 'http://localhost:8090/order'
    	        }
    	      }
    	    });
    	  },
    	  // onAuthorize() is called when the buyer approves the payment
    	  onAuthorize: function(data, actions) {
    	     actions.payment.execute().then(function() {
    	    	
    	    	 fetch('http://localhost:8060/order/', {
       	          method: 'post',
       	          headers: {
       	            'content-type': 'application/json'
       	          },
       	          body: JSON.stringify({
       	            orderID: data.orderID,
       	            data: mapToObj(Items),
					user_id:Cookies.get("user_id")
       	          })
       	        });
    	    	alert("Booking successfully!");
    	    	 return  actions.redirect();
    	      }
    	    );
    	  },

    	  onCancel: function(data, actions) {
    	    actions.redirect();
    	    }
    	}, '#paypal-button-container');

1. Redirect_urls: for us to set payment complete and cancel redirect url
2. OnAuthorize: is called when the buyer approves the payment and I also send a request to my order service for updating product quantity
3. OnCancel: is called when the buyer cancel

Result:

Reference:

Paypal
Paypal developer
PayPal-Java-SDK
PayPal 付款流程整合 後篇
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