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payment-processing

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Nexus is an open-source payment integration codebase on GitHub that wires Stripe and PayPal into custom ecommerce checkouts. It covers the operator workflows engineering teams typically build from scratch: tokenized card capture, subscription billing with renewal handling, and PCI-compliant data flows. The buyer here is a CTO or lead developer at a DTC brand or SaaS company who wants a reference implementation rather than a hosted checkout product like Bolt or Shop Pay.

> what it does

  • Integrates Stripe and PayPal gateways into custom checkout flows
  • Handles subscription billing logic including renewals and proration
  • Implements PCI-compliant card capture without storing sensitive data
  • Provides reference checkout UI patterns for web storefronts
  • Supports one-time and recurring payment intent workflows

> touches

> alternatives to payment-processing

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