Open Source Payment Software
Payment software helps businesses and organizations accept, route, record, and reconcile transactions between customers and payment providers. It can support online checkout, recurring charges, refunds, and transaction reporting, reducing manual work and connecting payment activity to other business systems. Payment workflows must also account for security, reliability, and the rules that apply to handling sensitive financial data.
Open source tools in this area include payment gateways, checkout components, provider integrations, and systems for transaction tracking or payment orchestration. When choosing one, check its maturity, license, maintenance activity, supported providers and APIs, and compatibility with your existing infrastructure. Review security practices and any compliance responsibilities involved in deployment. These tools can be useful to developers, merchants, nonprofits, and service providers that need adaptable payment workflows or want more control over their software.
2 repositories · updated September 12, 2026
Intent-Plane: Fail-Closed Authorization Gate for AI Agent Actions
Intent-Plane is a fail-closed authorization gate designed for AI agents performing irreversible actions, ensuring every decision is deterministic and auditable. It provides a durable record that third parties can re-verify independently, without needing to trust the gate's internal code. This system is crucial for applications in fintech, payments, and treasury, where accountability and security are paramount.
Lago: Open-Source Billing Platform for Usage-Based and Subscription Models
Lago is an open-source, AI-native billing platform designed for usage-based, subscription-based, and hybrid pricing models. It provides comprehensive infrastructure for metering, billing, and revenue management, enabling product-led companies to track and bill for any consumption. With its API-first approach and flexible deployment options, Lago offers a robust solution for modern billing needs.