Open-source alternatives offer extensive customization through public code access. Most of them provide free / paid cloud service. Some might require self-hosting to use.
Enhance your payment authorization rates and streamline transactions with intelligent routing and direct connections to global bank acquirers
Hyperswitch is an advanced payment orchestration platform designed to improve payment authorization rates and reduce processing latency. By intelligently routing transactions to the most suitable payment service providers (PSPs), Hyperswitch can achieve up to a 10% increase in successful authorizations. This system ensures that businesses can maximize their revenue potential by connecting directly with bank acquirers across various markets.
Manage your subscription and payment processes with complete control and customization, tailored to meet the unique needs of your organization
Kill Bill is an open-source billing and payment solution designed to cater to businesses of all sizes, from startups to large enterprises. It provides a comprehensive framework for managing subscriptions, payments, and financial reporting, allowing organizations to scale their billing infrastructure efficiently. With its robust partner ecosystem, Kill Bill integrates seamlessly with various payment gateways and fraud prevention tools, ensuring a versatile and secure payment experience.
Simplify your billing and payment processes while automating international tax compliance and upsales management with a focus on efficiency and transparency
Polar is a merchant of record platform that enables businesses to manage their payments seamlessly, handling everything from billing to international taxes. By automating complex payment processes, Polar allows developers and organizations to focus on their core operations without the hassle of financial administration. Its user-friendly interface and built-in analytics dashboard provide valuable insights into sales performance and customer engagement.
Streamline your invoicing processes with customizable billing models, automated notifications, and comprehensive analytics to support your business growth
UniBee is an open-source subscription management system designed to simplify billing and invoicing for businesses of all sizes. It offers a variety of customizable billing models, including recurring, one-time, and usage-based options, allowing organizations to tailor their payment structures to meet specific needs. With its user-friendly interface, UniBee enables businesses to manage their global audience efficiently through a single billing system.
Simplify your integration with multiple payment gateways using a consistent API that enhances flexibility and reduces development time
Omnipay is a robust payment processing library specifically designed for PHP, enabling developers to interact with various payment gateways through a unified interface. Inspired by Active Merchant, Omnipay provides a clear and consistent API that allows for easy switching between different payment providers without the need to rewrite code. This flexibility is particularly beneficial for projects that require support for multiple gateways.
Streamline your payment integration with a flexible framework that supports multiple gateways and provides robust features for managing transactions
Payum is an open-source payment processing library designed for PHP developers, enabling seamless integration with various payment gateways. It offers a unified API that simplifies the handling of complex payment processes, allowing developers to focus on building their applications rather than dealing with the intricacies of individual payment providers. Payum supports a wide range of gateways, making it versatile for different business needs.
Easily connect with multiple payment gateways using a consistent API that simplifies the complexities of online transactions
ActiveMerchant is a widely used Ruby library that provides a straightforward way to integrate payment processing into applications. Designed to work with various payment gateways, ActiveMerchant offers a unified interface that allows developers to handle transactions without needing to learn the specifics of each gateway. This flexibility makes it an ideal choice for developers looking to implement payment solutions quickly and efficiently.
If you are looking for more features or an enterprise solution, you might want to consider closed source alternatives. Some of them has decent free tier.
Empower your business to handle payments efficiently, optimize revenue, and innovate with ease
Stripe is a robust platform designed to streamline payment processing, enabling businesses to accept payments, manage revenue operations, and create new business models. With features that enhance authorization rates and checkout conversions, Stripe supports various payment methods across different markets. Additionally, it facilitates recurring billing and automates financial operations to minimize churn and maximize growth.
Streamline your billing, tax compliance, and subscription management with an all-in-one solution designed specifically for digital products
Paddle offers a complete billing solution tailored for businesses selling digital products, handling everything from payment processing to tax compliance. As a merchant of record, Paddle takes care of the complexities of transactions, allowing companies to focus on growth and innovation without the burden of administrative tasks. Its user-friendly interface and robust features ensure that businesses can efficiently manage their revenue streams.
Simplify your payment collection process with automated solutions for one-off and recurring transactions, reducing administrative burdens and costs
GoCardless is designed to streamline the collection of payments by allowing businesses to accept direct bank payments effortlessly. This platform enables both one-off payments and automated recurring transactions, eliminating the need for manual follow-ups on late payments. With its focus on Direct Debit, GoCardless reduces transaction fees typically associated with card payments, making it a cost-effective solution for businesses of all sizes.
Transform your business operations with integrated tools for payments, inventory, and customer engagement, all in one place
Square is a comprehensive payment processing solution designed to empower businesses of all sizes. It provides a range of services, including point-of-sale systems, online payment processing, and inventory management, making it easy for merchants to accept payments anywhere. With its user-friendly interface and robust features, Square helps businesses streamline their operations and enhance customer experiences.
Empower your operations with an all-in-one POS solution that streamlines payments, inventory management, and customer engagement, designed for businesses of any size
Clover offers a powerful point-of-sale (POS) system that adapts to various business environments, providing tools for payment processing, inventory tracking, and customer relationship management. With options like Clover Station, Mini, and Flex, businesses can choose the hardware that best fits their operational needs while benefiting from competitive transaction rates. Clover’s user-friendly interface ensures that users can quickly set up and manage their sales processes efficiently.
A simple solution for selling digital products and managing licenses