Hyperswitch is a composable open-source payments infrastructure built in Rust that provides a modular platform for processing payments through multiple connectors. The system handles the complete payment lifecycle including authorization, capture, refunds, and dispute management, while offering features like intelligent routing, 3DS authentication, revenue recovery, and analytics. Built with a microservices architecture using Actix-web, it features a plugin-based connector system, event-driven design with Redis/Kafka, and comprehensive SDK support for web and mobile platforms. The codebase demonstrates strong engineering practices with typesafe ID generation, robust encryption utilities, and well-abstracted interfaces that promote reusability and maintainability.
wechatpay-axios-plugin is a Node.js SDK for interacting with WeChat Pay APIs (both v2 and v3). It provides a promise-based, chained interface for making API requests, handles automatic request signing and response verification, includes cryptographic utilities for AES/RSA operations, and offers CLI tools for developers. The architecture centers around a Wechatpay class that creates axios instances for XML-based (APIv2) and JSON-based (APIv3) endpoints, with specialized transformers for data format conversion and security handling. The library actively maintains compatibility with modern Node.js versions and cryptographic standards.
HotGo is a full-stack rapid application development framework built on GoFrame (Go) and Vue 3 (Naive UI). It provides an admin panel with RBAC, multi-tenancy, code generation, plugin/addon system, and integrations for payments (Alipay/WeChat/QQ), SMS, email, file storage (local/S3/MinIO/COS/OSS), message queues (Redis/Kafka/RocketMQ/disk), WebSocket real-time messaging, TCP server with RPC, and cron scheduling. The backend follows a modular service layer with generated DAO/entity patterns and custom ORM handlers for data filtering, tenant isolation, and sorting. The frontend is a dynamic SPA with built-in components for tables, forms, modals, uploads, and charts, plus i18n support. The codebase is production-ready but heavily relies on code generation and custom forks of GoFrame CLI tools, introducing some maintenance risk. Designed primarily for Chinese developers building enterprise admin systems.
Invoice Ninja is a full-featured open-source invoicing and billing platform designed for small to medium businesses. It handles the complete lifecycle of invoices, quotes, credits, purchase orders, payments, and expenses. The system supports multi-tenant SaaS and self-hosted deployments with per-company database isolation, and integrates with over 20 payment gateways (Stripe, PayPal, Mollie, GoCardless, etc.). It provides client and vendor portals for self-service, along with extensive reporting, CSV export, and e-invoicing capabilities (Peppol, Verifactu, France e-reporting). The application follows a monolithic MVC architecture built on a custom PHP framework (Illuminate) similar to Laravel. It uses an event-driven architecture with domain events and listeners for side effects (email, webhooks, activity logging). Background jobs are queued for async processing. The frontend uses Blade templates, Livewire components, and a separate React app for some admin panels. The API is RESTful with OpenAPI documentation. Key entry points are HTTP controllers under app/Http/Controllers, with request validation classes. Core data flows involve creating entities through factories, persisting via repositories, and triggering events that listeners handle. Payment flows go through abstract payment drivers that encapsulate gateway-specific logic. The system also includes extensive reporting, CSV export, and e-invoicing (Peppol, Verifactu, France e-reporting). External dependencies include a relational database (MySQL/PostgreSQL), Redis for caching and queues, Elasticsearch for search, and various third-party APIs for payment processing, tax calculation (ZipTax), bank integration (Nordigen, Yodlee), email delivery (Mailgun, Postmark, Brevo), and e-invoicing gateways (Storecove, Qvalia).
This repository is a React Native library that integrates Paystack payment processing into mobile applications using a WebView-based modal. It provides a `PaystackProvider` component that wraps the app and exposes a `usePaystack` hook for initiating transactions. The library handles parameter validation, generates an inline Paystack checkout page, and communicates payment events back to the app via WebView postMessage. It also supports deep linking for payment channels like Zap, intercepting specific URLs and opening them via the OS. The architecture follows a Provider pattern with context, making the payment functionality accessible throughout the app. The code is written in TypeScript with full type definitions and includes a test suite using Jest. However, the package.json contains unrealistic dependency versions (e.g., react@^17.0.1) indicating potential maintenance issues. The core utility functions for URL routing and external URL opening are well-designed and could be reused in other projects.