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Showing 545 open source projects for "payment"
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Demo Series - Small Business Backup By VeeamWatch this on-demand demo series and learn how to protect your Microsoft 365 data with clear, simple, actionable steps that are easy to implement for businesses of all sizes.
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MongoDB Atlas runs apps anywhereMongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
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Gpt-Agreement-Payment
End-to-end protocol replay toolkit for ChatGPT Plus/Team/Pro sub
Gpt-Agreement-Payment is a research-oriented automation toolkit focused on subscription payment flows, protocol replay behavior, and anti-fraud mechanism analysis. It documents and implements controlled workflows around account setup, payment routing, runtime state storage, and operational monitoring. The project includes both command-line and web UI modes, with Docker and manual deployment options. -
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Hyperswitch
An open source financial switch to make payments fast
HyperSwitch is an Open Source Financial Switch to make payments Fast, Reliable, and Affordable. It lets you connect with multiple payment processors and route traffic effortlessly, all with a single API integration. Connect with multiple payment processors with a single API to improve payment conversions, and reduce costs and ops. Unified API with enterprise-grade scale & reliability. Achieve your goals with custom and smart routing algorithms. Cross-platform, native, seamless payment experience. ... -
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Payum
PHP Payment processing library
Payum is a PHP payment processing library that abstracts and unifies payment gateway integrations across different services like PayPal, Stripe, and Authorize.Net. It offers a modular architecture that supports various gateways and payment flows including recurring payments, tokenized sessions, and secure callbacks. Payum is ideal for developers building custom e-commerce or billing solutions with multiple payment options. -
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Yansongda Pay
Alipay/WeChat/Douyin/Unipay
Yansongda Pay is a PHP payment library that supports various Chinese payment gateways, including Alipay and WeChat Pay. It offers a simple and unified API for handling payments, refunds, and notifications. The library is designed for developers building e-commerce or service-based applications that require payment processing. It supports asynchronous notifications and provides easy configuration for different payment scenarios. -
Custom VMs From 1 to 96 vCPUs With 99.95% UptimeLive migration and automatic failover keep workloads online through maintenance. One free e2-micro VM every month.
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Stripe.net
Stripe.net is a sync/async .NET 4.6.1+ client
A .NET library to facilitate Stripe payment integration, supporting a full range of payment and subscription features for .NET applications. -
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Stripe Ruby Library
Ruby library for the Stripe API
A Ruby library that enables developers to integrate Stripe’s payment gateway into Ruby applications, streamlining billing, payments, and customer management. -
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braintree_ios
Braintree SDK for iOS
Braintree iOS is a comprehensive mobile payment SDK that allows developers to integrate secure payments into iOS apps. It supports credit cards, PayPal, Apple Pay, and other popular payment methods, providing a seamless checkout experience. The SDK emphasizes security, ease of integration, and compliance with industry standards. -
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GoPay Workflow Orchestrator
Lightweight process orchestration framework for regional payment
GoPay Workflow Orchestrator is a lightweight workflow orchestration framework for studying and debugging regional payment-chain flows. It focuses on engineering reliability in multi-stage payment journeys that involve provider redirects, tokenized requests, verification challenges, asynchronous polling, and final status confirmation. The project organizes scattered payment steps into a reproducible and observable process so developers can inspect state transitions and integration failures. ... -
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Nimiq Blockchain
JavaScript implementation of the Nimiq protocol
Nimiq is a unique open-source payment system. It empowers all humans with decentralized but easy payments. One-click creates a node in your browser. Send and receive directly to the blockchain and be truly independent. A simple, secure and censorship-resistant payment protocol, native to the web. Nimiq is a decentralized, censorship-resistant payment protocol native to the web, with its own diverse ecosystem of apps. -
Ship Agents FasterGemini Enterprise Agent Platform lets you rapidly build, scale, govern and optimize production-ready agents grounded in your organization's data. The platform enables developers to build custom or pre-built agents for virtually any use case. New customers get $300 in free credits.
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x402
A payments protocol for the internet. Built on HTTP
x402 is an open, HTTP-native payment protocol designed to enable programmatic, real-time payments directly within standard web requests. It repurposes the long-unused HTTP 402 “Payment Required” status code to allow servers to request payment before delivering content or API responses. The protocol supports multiple payment networks, including blockchain-based systems and fiat-compatible facilitators, making it flexible and network-agnostic. -
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WeChat Bill Analysis Tool
WeChat Bill Analysis Tool - A Visual Bill Analysis Application
WeChat Bill Analysis Tool is an Electron-based desktop application for visualizing and analyzing WeChat Pay bill exports. It helps users understand personal spending habits, income, expenses, payment methods, transaction types, and financial patterns from exported payment data. The app presents key totals such as income, spending, net balance, transaction count, time range, and bill metadata in a more readable dashboard. It also includes charts for comparing income and expenses, analyzing payment method distribution, and reviewing categories such as merchant purchases, transfers, red packets, and refunds. ... -
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Invoice Ninja
Free and Open Source Invoicing, Expenses & Time-Tracking
...It offers a plethora of great features, including custom branded invoice design, recurring invoicing and auto-bill clients, real-time quote creation and custom proposals, expense reporting and so much more! Invoice Ninja is also capable of handling online payments from more than 40 payment gateways, including Stripe, PayPal and WePay. It also accepts payments using credit cards, ACH, Bitcoin and more. Get paid online, organize project workflows with Kanban Boards, and track time online via your Webapp account all with Invoice Ninja. -
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Stripe AI
One-stop shop for building AI-powered products and businesses
...The platform is particularly relevant for companies building AI-driven products that require monetization, usage-based billing, or programmable financial interactions. By offering ready-to-use integrations and development tools, Stripe AI reduces the complexity of connecting AI systems with payment services. -
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React Native Wallet
React Native module for adding payment cards
...The package is useful for fintech apps, expense platforms, banking products, corporate card tools, and payment experiences. Its main value is simplifying a complex native wallet integration into a reusable React Native component and module. -
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Hi.Events
Open-source event management and ticket selling platform
...It provides features for event creation, ticket sales, attendee registration, and real-time analytics. The platform is highly customizable, allowing users to set up public or private events, integrate payment gateways, and monitor event metrics through an intuitive dashboard. Hi.Events is ideal for community gatherings, conferences, and professional events. -
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OpenMeter
Metering and Billing for AI, API and DevOps
...It supports high-scale event ingestion and deduplication to accurately record how customers consume billable resources such as API calls, compute time, or storage, and then correlates that usage with payment systems and billing plans to automate invoicing and revenue recognition. The system includes metering, storage, cataloging of products and pricing rules, and tools to enforce limits or quotas, supporting both self-service customer portals and internal dashboards. OpenMeter integrates with payment processors, CRMs, and analytics systems, letting teams launch complex pricing models or subscription tiers without heavy custom engineering work. -
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OpenCart
A free shopping cart system
...The OpenCart marketplace features 13000+ modules and themes to jump-start, grow and expand your business. You can find beautiful themes for just about any sector, service integrations, payment providers, shipping methods, social media, marketing, accounting, reporting, sales as well as language packs. The world's most renowned payment gateways and shipping methods integrated for you -
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Fluwx
WeChat SDK for flutter
fluwx is a Flutter plugin that provides a complete set of integrations with WeChat, one of the largest messaging and payment platforms in the world. It enables login, sharing (text, images, links, music, and videos), WeChat Pay, mini-program launching, and more directly from Flutter apps. The library abstracts platform-specific code for Android and iOS, exposing a unified Dart API. It’s frequently used by apps targeting the Chinese market or international businesses requiring WeChat payment gateways. ... -
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Agentic Commerce Protocol (ACP)
Interaction model for connecting buyers to complete purchases
...The repository organizes the spec as human-readable RFCs plus machine-readable OpenAPI and JSON Schema definitions, along with worked examples and a changelog so integrators can track breaking changes. Practically, ACP defines three main pieces; a Product Feed for discovery, an Agentic Checkout API for stateful, in-conversation checkout, and a Delegated Payment flow so a merchant’s existing PSP securely handles payment credentials and settlement. Merchants remain the merchant-of-record—orders, fraud controls, payment authorization/capture, refunds, and post-purchase communication all stay on their systems while the agent surfaces status to the buyer. -
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WxJava
WeChat develops Java SDK, supports back-end development
WeChat develops Java SDK, supports back-end development including WeChat payment, open platform, small program, enterprise WeChat, official account, etc. For project cooperation and negotiation, please contact WeChat binary0000(search and add friends in WeChat, please indicate the intention of coming, if you need to discuss about SDK issues, please refer to the group discussion below, do not add this WeChat). -
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Stripe Node.js Library
Node.js library for the Stripe API
The Stripe Node library provides convenient access to the Stripe API from applications written in server-side JavaScript. For collecting customer and payment information in the browser, use Stripe.js. -
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Bindu
Bindu: Turn any AI agent into a living microservice
Bindu is an open-source infrastructure layer that transforms any AI agent into a production-ready microservice capable of interacting, communicating, and transacting within a broader network of agents. It abstracts away the complexity of deployment, authentication, communication protocols, and payment systems by allowing developers to “bindufy” an agent with minimal configuration. Once integrated, the agent gains a decentralized identity, standardized communication capabilities through protocols such as A2A and AP2, and built-in support for authentication and monetization. The system is designed to be framework-agnostic, meaning developers can build agents using tools like LangChain, OpenAI SDK, or custom implementations and still deploy them seamlessly. ... -
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FOSSBilling
Empower your hosting business with FOSSBilling
...Because it’s self-hosted and licensed under the Apache 2.0 license, organizations have full control over their data and can customize or extend the system to fit unique workflows or branding requirements. FOSSBilling supports integration with numerous control panels and payment gateways, helping businesses automate domain management, hosting account creation, and customer notifications without manual intervention. The platform is built to be extensible, with a modular architecture that allows developers to add new features, themes, or third-party extensions. -
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Mckay’s App Template
This is the template I use to start new full-stack projects
...The template includes a frontend built with Next.js, Tailwind CSS, and often UI components/frameworks like Shadcn + Framer Motion; a backend stack using PostgreSQL, Supabase, and Drizzle ORM for database operations; authentication via Clerk; and optional payment integration using Stripe. By providing a ready-to-go configuration (with example folder structure, database setup, auth, payment hooks, and environment templates), it lets developers skip the tedious initial setup and get straight to building product features. The template is ideal for startups, prototypes, or side-projects where you want a robust, production-grade starting point — with user accounts, auth, DB, and payments already wired up. -
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bitcoinj
A library for working with Bitcoin
...It's implemented in Java but can be used from any JVM compatible language, examples in Python and JavaScript are included. Highly optimized lightweight simplified payment verification (SPV) mode. In this mode, only a small part of the blockchain is downloaded, making bitcoin suitable for usage on constrained devices like smartphones or cheap virtual private servers. A wallet class with encryption, fee calculation, multi-signing, deterministic key derivation, pluggable coin selection/coin control, extensions support and event listeners that let you stay up to date with changes in your balance. ...
