#atom

Integrating financial transactions into web applications

Core Idea: Payment processing systems allow web applications to securely handle financial transactions by connecting to payment service providers who manage the complexities of transaction processing, security, and compliance.

Key Elements

• Key features

  • Securely collect payment information
  • Process one-time and subscription payments
  • Handle refunds and disputes
  • Generate invoices and receipts
  • Track payment history

• Technical specifications

  • Payment providers (Stripe, PayPal, etc.)
  • Client-side components (payment forms, buttons)
  • Server-side integrations (API endpoints)
  • Webhooks for transaction events
  • Subscription management tools

• Implementation steps

  1. Register with a payment provider
  2. Set up development environment with test keys
  3. Implement payment flow UI components
  4. Create server endpoints for processing payments
  5. Configure webhooks to handle payment events

• Code example (Next.js with Stripe)

// pages/api/create-checkout-session.js
import Stripe from 'stripe';

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY);

export default async function handler(req, res) {
  if (req.method !== 'POST') {
    return res.status(405).json({ error: 'Method not allowed' });
  }

  try {
    const { priceId } = req.body;
    
    // Create Checkout Session
    const session = await stripe.checkout.sessions.create({
      payment_method_types: ['card'],
      line_items: [
        {
          price: priceId,
          quantity: 1,
        },
      ],
      mode: 'subscription',
      success_url: `${req.headers.origin}/success?session_id={CHECKOUT_SESSION_ID}`,
      cancel_url: `${req.headers.origin}/pricing`,
    });

    res.status(200).json({ sessionId: session.id });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
}

Additional Connections

• Broader Context: E-commerce Architecture (payment is one component of larger systems)
• Applications: Subscription Business Models (recurring payment implementation)
• See Also: Payment Gateway Security (specific security considerations)

References

1. Stripe Documentation: https://stripe.com/docs
2. PCI DSS Compliance: https://www.pcisecuritystandards.org/

#payments #web-development #e-commerce

Connections:

Sources:

• From: Marc Lou - Coding in 2025 is EASY (full roadmap to build ANY project from 0)