Running this product as a subscription engine reveals its strong catalog management and plugin capabilities, allowing for extensive customization without altering the core system. Understanding the nuances of date management and subscription states is crucial, as mismanagement can lead to unexpected billing issues.
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Kill Bill (https://killbill.io/) is an open-source subscription billing and payment platform, in production since 2010 and licensed under Apache 2.0. It covers subscriptions and plan changes, catalog and pricing, invoicing, credits, payment routing across gateways through a plugin architecture, and dunning. The core is free and self-hostable, so companies keep control of their billing data and of the infrastructure it runs on. Aviate, the enterprise version built by the same team, adds catalog management through APIs, metering, wallet and credits, tax computation and an admin workspace, with Level 3 support from the engineers. Aviate costs 9,999 USD per month, billed annually, never a percentage of revenue and never a per-transaction charge.
