A payments Microservice

We at Justflows.com, have recently developed a microservices architecture from scratch in order to improve the scalability and flexibility and be future-proof. We have divided our application into a set of small, independent services that communicate with each other through well-defined APIs.

Some of the microservices that JustFlows.com is using include:

• Authentication microservice: This microservice is responsible for handling user authentication and authorization. It provides secure access to the other microservices through JWT tokens.
• Invoice microservice: This microservice manages the invoices and provides the necessary APIs for adding, updating, and deleting invoices.
• Customer microservice: This microservice handles the entire Customer management process, from customer management to payment processing and Subscription tracking.
• Notification microservice: This microservice is responsible for sending notifications to users about order updates and other important events.

Now, let’s take a look at an example of how to write a payment connector as a microservice using TypeScript. In this example, we will create a simple payment microservice that communicates with the invoice microservice to process payments.

First, let’s define our API for the payment microservice:

import { Router } from 'express';

const router = Router();

router.post('/process', async (req, res) => {
  // Process payment and return result
});

export default router;

Next, we need to implement the logic for processing payments. We’ll use the Stripe API to process payments, but you could use any payment gateway of your choice.

import { Router } from ‘express’;
import Stripe from ‘stripe’;

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY, {
  apiVersion: '2020-08-27',
});

const router = Router();

router.post(‘/process’, async (req, res) => {
  try {
    const { amount, token } = req.body;
    const charge = await stripe.charges.create({
      amount,
      currency: ‘eur’,
      source: token,
    });
    // Payment successful, update invoice status
    res.status(200).send({ success: true });
  } catch (error) {
    // Payment failed, return error message
    res.status(400).send({ success: false, error: error.message });
  }
});

export default router;

In the above code, we’re using the Stripe API to create a charge with the provided token and amount. If the charge is successful, we update the invoice status to indicate that the payment has been processed. If the charge fails, we return an error message.

Finally, we need to make sure that the payment microservice can communicate with the invoice microservice. We can use a REST API to achieve this. Here’s an example of how to update the Invoice payment status from the payment microservice:

import axios from 'axios';

const updateInvoicePaymentStatus = async (invoiceId: string, status: string) => {
  try {
    const response = await axios.put(`${process.env.INVOICE_SERVICE_URL}/invoice/${invoiceId}`, {
      status,
    });
    console.log(response.data);
  } catch (error) {
    console.log(error.message);
  }
};

In the above code, we’re making a PUT request to the order microservice API to update the invoice status. We pass in the invoiceId and the new status as parameters. If the update is successful, we log the response data. If there’s an error, we log the error message.

In conclusion, microservices are a powerful way to design and build complex applications. They allow you to break down your application into small, manageable services that can be developed and deployed independently. Writing a payment connector as a microservice is just one example of