---
title: 'Payment and Fintech'
description: 'Explore the architecture of a payment system and a fintech system. Look at the real-world examples of payment systems like PayPal, Stripe, and Square.'
image: 'https://github.com/ByteByteGoHq/system-design-101/raw/main/images/oAuth2.jpg'
icon: '/icons/medal.png'
sort: 160
---

Payment and Fintech are two of the most popular categories in system design interviews. In these guides, we will explore the architecture of a payment system and a fintech system.