# Paytm Payment System

> Transactional peer-to-peer wallet

Canonical page: https://www.pradhumn.com/projects/payment-system

Full stack · Data integrity

A full-stack wallet for account creation, balance management, recipient discovery, and peer-to-peer transfers, with consistency at the center of money movement.

## Design decisions

- Protected account operations with JWT authentication and validated API payloads using Zod.

- Used MongoDB sessions so sender debits and recipient credits commit atomically or roll back together.

- Built searchable recipient discovery and a focused React transfer experience.

## Technologies

React, JavaScript, Express, MongoDB, JWT, Zod

## Sources

- [Source code](https://github.com/pradhumngautam/paytm-2)