Showing 526 open source projects for "payment"

View related business solutions
  • MongoDB Atlas runs apps anywhere Icon
    MongoDB Atlas runs apps anywhere

    Deploy in 115+ regions with the modern database for every enterprise.

    MongoDB 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.
    Start Free
  • Go From AI Idea to AI App Fast Icon
    Go From AI Idea to AI App Fast

    One platform to build, fine-tune, and deploy ML models. No MLOps team required.

    Access Gemini 3 and 200+ models. Build chatbots, agents, or custom models with built-in monitoring and scaling.
    Try Free
  • 1
    Payum

    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 2
    Hyperswitch

    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. ...
    Downloads: 1 This Week
    Last Update:
    See Project
  • 3
    Yansongda Pay

    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 4
    Stripe.net

    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.
    Downloads: 1 This Week
    Last Update:
    See Project
  • Earn up to 16% annual interest with Nexo. Icon
    Earn up to 16% annual interest with Nexo.

    Let your crypto work for you

    Put idle assets to work with competitive interest rates, borrow without selling, and trade with precision. All in one platform. Geographic restrictions, eligibility, and terms apply.
    Get started with Nexo.
  • 5
    braintree_ios

    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 6
    Nimiq Blockchain

    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 7
    Stripe Ruby Library

    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    Invoice Ninja

    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.
    Downloads: 12 This Week
    Last Update:
    See Project
  • 9
    Stripe AI

    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Forever Free Full-Stack Observability | Grafana Cloud Icon
    Forever Free Full-Stack Observability | Grafana Cloud

    Our generous forever free tier includes the full platform, including the AI Assistant, for 3 users with 10k metrics, 50GB logs, and 50GB traces.

    Built on open standards like Prometheus and OpenTelemetry, Grafana Cloud includes Kubernetes Monitoring, Application Observability, Incident Response, plus the AI-powered Grafana Assistant. Get started with our generous free tier today.
    Create free account
  • 10
    Agentic Commerce Protocol (ACP)

    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 11
    Hi.Events

    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.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 12
    OpenCart

    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
    Downloads: 22 This Week
    Last Update:
    See Project
  • 13
    FOSSBilling

    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 14
    OpenMeter

    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 15
    Wallos

    Wallos

    Open-source, self-hostable personal subscription tracker

    ...It focuses on turning subscriptions into a clear, organized view of your financial commitments, helping you spot waste, anticipate upcoming charges, and plan your budget with fewer surprises. The app supports subscription management with due dates and payment schedules so you can keep track of what’s active and when it renews. To make analysis more meaningful, Wallos includes category management so you can group expenses and identify spending patterns over time. It also supports multiple currencies, which is especially useful for people paying for services in different billing regions or traveling between countries.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 16
    Bindu

    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. ...
    Downloads: 3 This Week
    Last Update:
    See Project
  • 17
    WxJava

    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).
    Downloads: 1 This Week
    Last Update:
    See Project
  • 18
    Mckay’s App Template

    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    Fluwx

    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. ...
    Downloads: 2 This Week
    Last Update:
    See Project
  • 20
    RoboSats

    RoboSats

    A simple and private bitcoin exchange

    RoboSats is a privacy-preserving, peer-to-peer Bitcoin exchange that allows users to buy and sell Bitcoin using Lightning Network payments without requiring identity verification. It uses Tor by default and leverages a simple robot-based user interface to facilitate one-time trades between anonymous users. Each trade session is isolated, and no long-term accounts or KYC are needed, making RoboSats one of the most private Bitcoin P2P tools available. Designed with a strong focus on usability...
    Downloads: 48 This Week
    Last Update:
    See Project
  • 21
    Magento Open Source

    Magento Open Source

    eCommerce Platform for Developers and Small Businesses

    Magento is an open-source e-commerce platform written in PHP
    Downloads: 5 This Week
    Last Update:
    See Project
  • 22
    bitcoinj

    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. ...
    Downloads: 4 This Week
    Last Update:
    See Project
  • 23
    Liberapay

    Liberapay

    Source code of the recurrent donations platform Liberapay

    ...Liberapay distinguishes itself by not taking a commission from donations, instead relying on voluntary contributions to sustain the platform itself. It supports multiple currencies and integrates with payment processors such as Stripe and PayPal, enabling global participation. The system also includes features like team-based funding, pledges for users not yet registered, and public transparency of donation flows.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    BTCPay Server

    BTCPay Server

    Free, open-source & self-hosted, Bitcoin payments

    BTCPay Server is a self-hosted, open-source cryptocurrency payment processor. It's secure, private, censorship-resistant, and free. Launch a server in a cloud, your own hardware device, or use an existing host. Connect your e-commerce store or use one of many apps to get paid. Funds arrive directly to your connected wallet. Features you use the most are baked right into every instance so you can hit the ground running.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 25
    Bitcart

    Bitcart

    Bitcart is a platform for merchants, users and developers

    An open-source platform for managing cryptocurrency payments and stores without intermediaries.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Previous
  • You're on page 1
  • 2
  • 3
  • 4
  • 5
  • Next
MongoDB Logo MongoDB