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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
TranslatedWeChat development Java SDK, supporting back-end development for WeChat Pay, Open Platform, Mini Programs, WeCom (Enterprise WeChat), Channels (video accounts), Official Accounts, and more
Polar — A billing platform for the intelligence era
Bindu: The identity, communication, and payments layer for AI agents.
TranslatedWeChat all-platform .NET SDK, Senparc.Weixin for C#, supporting .NET Framework, .NET Core, and .NET 10.0. Already supports all platforms including WeChat Official Accounts, Mini Programs, Mini Games, WeChat Pay, WeCom (Enterprise WeChat)/Enterprise Accounts, Open Platform, JSSDK, and WeChat peripherals. WeChat SDK for C#.
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.
Lightweight In App Purchases Swift framework for iOS 8.0+, tvOS 9.0+ and macOS 10.10+ ⛺
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.
TranslatedJeepay is an open-source payment system suitable for internet companies, supporting multi-channel service provider and regular merchant modes. It has been integrated with the official interfaces of WeChat Pay, Alipay, and UnionPay QuickPass (云闪付), and supports aggregated code payment.
A framework agnostic, multi-gateway payment processing library for PHP 5.6+
Open-Source Subscription Billing & Payments Platform
TranslatedGo version SDK for WeChat, Alipay, Douyin, Allinpay, Lakala, PayPal, and Apple. [A minimalist, easy-to-use aggregated payment SDK]
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
TranslatedXPay personal payment collection system with no signing-up required. Completely free. Funds go directly to your own account. Supports Alipay, WeChat, QQ, and UnionPay QuickPass (云闪付). No filing/registration (备案) required, no contract signing, no always-on monitoring app, no plugins, no third-party payment SDK, no business license or ID card. All you need is a payment QR code to get the payment flow done. Mobile payment is now supported.
TranslatedRoncoo Pay (roncoo-pay, 龙果支付系统, "Dragon Fruit Payment System") is the first open-source internet payment system in China. It has an independent account system, user system, payment access system, payment transaction system, and reconciliation, clearing and settlement system. Its goal is to build a lightweight, easy-to-use payment collection system that integrates mainstream payment methods, enabling internet business systems to connect payment channels and achieve functions such as payment collection and business fund management.
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.
Node.js library for the Stripe API.
Buyer-controlled client for x402 API payments in USDC on Base.
PHP library for the Stripe API.
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.
Go library for the Stripe API.
Laravel Cashier provides an expressive, fluent interface to Stripe's subscription billing services.