Search Results for "payments"
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Showing 319 open source projects for "payments"
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1
Agent Payments Protocol (AP2)
Building a Secure and Interoperable Future for AI-Driven Payments
AP2 is a project released by Google’s “Agentic Commerce” initiative, focusing on a protocol and reference implementation for agent-driven or AI-mediated payments. In effect, AP2 aims to define a secure, interoperable protocol that allows software agents to act on behalf of users—making payments or shopping decisions autonomously—while preserving necessary security, auditability, and trust. The repository contains sample scenarios (in Python, Android, etc.) that illustrate how agents, servers, and payments flows would work under the protocol. ... -
2
DePay
JavaScript library to integrate various web3 crypto wallets
...Everything starts with a simple integration. We worked hard so that you don't have to spend months implementing Web3 Payments on your own. Discover how simple decentralized Web3 Payments can be. No boundaries, no signup. A few lines of code will allow you to accept Web3 Payments peer-to-peer. -
3
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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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. -
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5
SolidInvoice
Simple and elegant invoicing solution
...It helps you manage clients, contacts, day-to-day billing and more so you can always get paid right and on time. SolidInvoice is capable of handling recurring invoices, quotes and estimates, as well as online payments. You can receive payments from a number of different gateways such as Paypal Express, Stripe Checkout, Be2bill and more. It also supports multiple currencies. SolidInvoice has a powerful and flexible RESTful API so you can easily integrate it to any other service. -
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Kaneo
An open source project management platform
Kaneo is a lightweight invoicing and client management tool for freelancers and small businesses. Built as a modern, self-hosted solution, Kaneo helps users generate invoices, track payments, and manage clients from a user-friendly dashboard. It's especially useful for independent workers who prefer local control over SaaS options. -
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Frappe Books
Free Desktop book-keeping software for small-businesses & freelancers
Frappe Books is a free and open source desktop book-keeping software that's simple and well-designed to be used by small businesses and freelancers. It's got everything you need from a small business accounting tool: invoices, billing, payments, reporting and more. It's made to work offline using a local SQLite file as the database, so you don't have to be dependent on a Cloud service provider. Frappe Books features a clean and modern, web-friendly UI, beautiful invoice templates, standard financial reports and other great features. It's inherently portable and secure, as your data is never uploaded into the Cloud. -
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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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GoShip
Opinionated Go/HTMX boilerplate with payments, emails, auth, etc.
An opinionated Go and HTMX boilerplate featuring payments, emails, authentication, and notifications. A Go + HTMX boilerplate with all the essentials for your SaaS, AI tools, or web apps. Start earning online quickly without the hassle. -
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10
Fedimint
Federated E-Cash Mint
Fedimint is a modular open-source implementation of federated Chaumian ecash designed to enable community-controlled Bitcoin custody and privacy-enhanced payments. It allows groups of users to collectively manage Bitcoin in a trust-minimized manner while enabling fast, anonymous, and scalable transactions through blind signatures. Built with extensibility and modularity in mind, Fedimint aims to serve as the core of community custody systems like Fedi and future federated finance applications. ... -
11
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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Litecoin Core integration
Litecoin source tree
Litecoin is a peer-to-peer Internet currency that enables instant, near-zero cost payments to anyone in the world. Litecoin is an open-source, global payment network that is fully decentralized without any central authorities. Mathematics secures the network and empowers individuals to control their own finances. Litecoin features faster transaction confirmation times and improved storage efficiency than the leading math-based currency. -
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ethereum.org website
Ethereum.org is a primary online resource for the Ethereum community
...The tech is new and ever-evolving, so it helps to have a guide. Here's what we recommend you do if you want to dive in. Ethereum is a technology that's home to digital money, global payments, and applications. The community has built a booming digital economy, bold new ways for creators to earn online, and so much more. It's open to everyone, wherever you are in the world – all you need is the internet. Today, billions of people can’t open bank accounts, others have their payments blocked. Ethereum's decentralized finance (DeFi) system never sleeps or discriminates. ... -
14
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. Create a Point-of-Sale app for your store, easily embed a tipping button... -
15
Nano
Nano is a cryptocurrency
...Just like the cash in your pocket, choosing to transact with nano ensures that 100% of the value is transferred directly to the recipient. Created to facilitate both local and international payments, choosing to use nano makes moving money across borders effortless and feeless. Explore the rich ecosystem of apps, merchants, and exchanges. Nano is a digital payment protocol designed to be accessible and lightweight, with a focus on removing inefficiencies present in other cryptocurrencies. With ultrafast transactions and zero fees on a secure, green, and decentralized network, this makes Nano ideal for everyday transactions. -
16
Gumroad
Sell stuff and see what sticks
...The codebase demonstrates practical patterns for multi-tenant architecture, permissions, testing, and asynchronous processing at scale. For engineers, it’s both a working marketplace and a study in how to balance flexibility for creators with reliability in payments and delivery. -
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Lightning Network Daemon
A complete implementation of a Lightning Network node
The Lightning Network Daemon (lnd), is a complete implementation of a Lightning Network node. lnd has several pluggable back-end chain services including btcd (a full-node), bitcoind, and neutrino (a new experimental light client). The project's codebase uses the btcsuite set of Bitcoin libraries and also exports a large set of isolated re-usable Lightning Network-related libraries within it, and fully conforms to the Lightning Network specification (BOLTs). BOLT stands for Basis of... -
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Phoenix Kotlin
Self-custodial Bitcoin wallet using Lightning to send/receive payments
Phoenix is a Bitcoin wallet developed by ACINQ, that allows you to send and receive bitcoins securely over the Lightning Network. It is self-custodial, which means that you hold the keys of the wallet. It provides a simple and clean UX. Thanks to native Lightning support, payments are faster and cheaper. This wallet is self-custodial. It means that, when creating a new wallet, a 12-words recovery phrase is generated. Only you have it. It is your responsibility to make a backup of that recovery phrase. It gives full access to your funds, so do not share it with anyone. If you lose the recovery phrase, your funds are lost. -
19
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. -
20
c-lightning
BOLT-compliant Lightning Network implementation
...The Lightning Network is an off-chain, routed payment channel network built on top of the Bitcoin blockchain. The network consists of nodes connected by peer-to-peer channels. This allows low cost, near-instant payments to be trustlessly routed across the network via connected nodes. On top of complying with all BOLT standards, c-lightning is developing an architecture for plugins. Plugins can be built to extend the c-lightning command line API. There are a number of developer tools, libraries and plugins that exist for the c-lightning implementation. -
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Bitcart
Bitcart is a platform for merchants, users and developers
An open-source platform for managing cryptocurrency payments and stores without intermediaries. -
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Dolibarr
Dolibarr ERP CRM is a modern software package to manage your company
Dolibarr is an open-source ERP (Enterprise Resource Planning) and CRM (Customer Relationship Management) software designed for small to medium-sized businesses. It includes a suite of features for managing a company’s operations, including invoicing, project management, inventory, and HR. Dolibarr is highly modular, meaning users can activate only the features they need, making it scalable and adaptable for different business models. -
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Personal Management System
Your web application for managing personal data
...Anyone with development knowledge can pretty much write their own extensions for personal needs. Keep a track of your personal goals. You can use tools to keep track of your goals progress or use the payments submodule to keep an eye of the money amount that you want to collect for something. Add any personal note to the desired category. Here, you can keep any small information that you need; it can be either quick notes from phone calls, a bunch of information collected all around different pages, or some links to things that you want to check somewhere later in the future. -
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Dash Core staging tree
Reinventing cryptocurrency
Dash is an experimental digital currency that enables instant, private payments to anyone, anywhere in the world. Dash uses peer-to-peer technology to operate with no central authority, managing transactions and issuing money are carried out collectively by the network. Dash Core is the name of the open-source software which enables the use of this currency. Ready to start making everyday purchases with digital cash? -
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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.
