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Open source, composable payments platform | PCI compliant | SaaS and Self-host options | Enables connectivity to multiple payment, payout, fraud, vault and tokenization providers | Uplifts authorization with intelligent routing and revenue recovery | Reduce payment processing costs with cost observability | Reduces payment ops with reconciliation
Polar — A billing platform for the intelligence era
Bindu: The identity, communication, and payments layer for AI agents.
Accept Bitcoin payments. Free, open-source & self-hosted, Bitcoin payment processor.
The user infrastructure platform. You choose the frontend, backend, and database. Hexclave handles everything else.
A payments protocol for the internet. Built on HTTP.
TranslatedIJPay puts payments within easy reach. It wraps common payment methods such as WeChat Pay, QQ Pay, Alipay, JD Pay, UnionPay, and PayPal, along with various commonly used interfaces. It does not depend on any third-party MVC framework; used purely as a tool, it lets you develop a payment module simply and quickly, and it can be easily embedded into any system. Click the little star ✨ in the upper right corner.
A framework agnostic, multi-gateway payment processing library for PHP 5.6+
Open-Source Subscription Billing & Payments Platform
TranslatedPossibly the most elegant payment SDK extension package for Alipay/WeChat/Douyin/Unipay/江苏银行 (Bank of Jiangsu) that I have ever used
Active Merchant is a simple payment abstraction library extracted from Shopify. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.
Buyer-controlled client for x402 API payments in USDC on Base.
开源优雅的跨平台收款网关 GM Pay(formerly known as EPUSDT)
Building a Secure and Interoperable Future for AI-Driven Payments.
第三方支付对接全能支付Java开发工具包.优雅的轻量级支付模块集成支付对接支付整合（微信,支付宝,银联,友店,富友,跨境支付paypal,payoneer(P卡派安盈)易极付）app,扫码,网页刷脸付刷卡付条码付转账服务商模式,微信分账,微信合单支付、支持多种支付类型多支付账户，支付与业务完全剥离，简单几行代码即可实现支付，简单快速完成支付模块的开发，可轻松嵌入到任何系统里 目前仅是一个开发工具包（即SDK），只提供简单Web实现，建议使用maven或gradle引用本项目即可使用本SDK提供的各种支付相关的功能
A self-hosted UPI & COD payment gateway with zero per-transaction platform fees, universal JavaScript checkout integration, dynamic QR payments, WhatsApp OTP authentication, and automated payment verification.
API Pix: a API do Arranjo de Pagamentos Instantâneos Brasileiro, Pix, criado pelo Banco Central do Brasil.
Laravel Cashier provides an expressive, fluent interface to Stripe's subscription billing services.
Payment是php版本的支付聚合第三方sdk，集成了微信支付、支付宝支付、招商一网通支付。提供统一的调用接口，方便快速接入各种支付、查询、退款、转账能力。服务端接入支付功能，方便、快捷。
Payments for Ruby on Rails apps
PHP Payment processing library. It offers everything you need to work with payments: Credit card & offsite purchasing, subscriptions, payouts etc.
TranslatedA lightweight USDT/USDC payment gateway with multi-chain support, integration guides, SDK documentation, and merchant demos.
Stripe.net is a sync/async .NET 4.6.1+ client, and a portable class library for stripe.com.
A modern In-App Purchases management framework for iOS.