Kill Bill

Kill Bill is the leading open-source subscription billing and payment platform, trusted by SaaS companies, marketplaces, and usage-based businesses to handle the full monetization lifecycle from catalog definition to revenue recognition. Originally developed at Ning and now maintained by an active open-source community, Kill Bill processes millions of invoices per month across production deployments and offers a programmable alternative to proprietary billing platforms like Recurly, Chargebee, and Zuora that charge per-transaction fees and lock customers into vendor-defined data models. The platform pairs a powerful billing core with the Kaui administrative console, giving engineering teams a flexible subscription engine and finance teams a polished web UI for everyday operations.

Common Use Cases

SaaS companies use Kill Bill to model tiered subscription plans, free trials, annual contracts with monthly proration, add-on products, and usage-based overages, with the catalog versioning system ensuring grandfathered customers stay on legacy pricing while new sign-ups land on current plans. Marketplaces deploy Kill Bill to split payments between platform commissions and seller payouts, manage seller account hierarchies, and handle chargebacks and refunds across thousands of transactions while integrating with payment gateways like Stripe, Adyen, and Braintree through interchangeable plugins. Usage-based companies leverage Kill Bill's metering plugins to ingest consumption events, calculate invoices based on tiered or volume pricing, and rate millions of API calls or compute hours without writing custom billing logic. Finance and operations teams use the Kaui admin UI to investigate billing disputes, issue refunds and credits, adjust subscription dates, and run analytics on monthly recurring revenue, churn, and lifetime value across customer cohorts. Engineering teams integrate Kill Bill with their internal CRMs, accounting systems, and customer portals through the REST API and webhook system, automating customer provisioning on payment success and deactivation on dunning failure without any direct database coupling.

Key Features

• Subscription engine with trials, fixed-term contracts, proration, and catalog versioning
• Pluggable payment gateways including Stripe, Adyen, Braintree, PayPal, and Cybersource
• Automated invoicing, dunning, and revenue recovery with configurable retry rules
• Kaui administrative console for accounts, invoices, refunds, and plan changes
• REST API and Java/Ruby plugin SDK for deep integrations and custom logic
• Multi-tenancy with isolated catalogs, credentials, and configuration per brand or region
• Multi-currency invoicing and exchange rate handling for international businesses
• Comprehensive audit logging required for SOC 2 and financial compliance
• Webhook notifications for downstream provisioning and CRM synchronization
• Tax engine plugins integrating with Avalara, TaxJar, and other tax providers
• Refunds, partial credits, chargeback handling, and dispute management
• Analytics plugins exposing MRR, churn, LTV, and other revenue metrics

Why deploy Kill Bill on Hostinger VPS

Deploying Kill Bill on Hostinger VPS keeps sensitive billing data — customer payment metadata, subscription history, pricing logic, and revenue records — on infrastructure you control rather than commercial billing platforms that charge per-transaction fees or hold critical revenue data hostage during contract negotiations. Self-hosting eliminates the variable cost of per-invoice or percentage-based platform fees that make hosted billing solutions expensive as transaction volume grows, allowing fast-growing businesses to scale without watching infrastructure costs balloon alongside revenue. The MariaDB database persists years of invoice history, audit logs, and transaction records required for financial compliance, while dedicated VPS resources ensure consistent billing performance during peak periods like end-of-month invoicing or annual renewal cycles. Direct VPS access lets engineering teams customize Kill Bill plugins for unique pricing models, integrate with internal data warehouses for revenue analytics, and implement region-specific tax compliance without the customization limits imposed by commercial billing SaaS providers. With full control over backups and disaster recovery, businesses can meet aggressive RPO and RTO targets that protect against data loss during the most critical billing cycles, ensuring revenue recognition and customer billing continue uninterrupted regardless of upstream service issues.