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This repository contains the source code for Gumroad’s e-commerce platform, exposing how a modern creator-focused storefront and payments system is assembled. The app models products, variants, subscriptions, and checkout flows, then ties them to fulfillment, licensing, and customer communications. It implements typical marketplace concerns—order management, refunds, discounts, taxes, fraud checks, and analytics—through well-defined services and background jobs. The UI offers product pages,...

Coupa e-Procurement is a requisition and purchase order system with best-in-class usability. Built to manage employee purchasing, it includes catalog management, shopping cart buying, approvals, purchase orders and more. Built in Ruby on Rails.

Cassiopeia is an open source shopping cart system written in Ruby programming language.

Billing system solution. Library for credit card/ACH processing, recurring billing and subscription management for member and donor centered organizations. Provides a way for POS / retail / recurring credit card and bank account processing.