Partners

Kill Bill Partners: a Billing System Built Around Your Business

You do not need to build billing from scratch. Start with open source Kill Bill, then work with partners for hosting, implementation, tax, payments and testing.

Last updated: October 2026

Short answer

Who can help me build a billing system with Kill Bill?

Kill Bill is open source, so your own team can run it and write plugins. For the rest, partners help: ChaChing hosts Kill Bill for you, Wovenware builds plugins and customizations, Bill Rush offers a supported Kill Bill distribution, Numerio provides a test suite, and Avalara and Forte connect tax and ACH payments. The Kill Bill team does not build custom plugins, but Aviate, the enterprise offering of Kill Bill, includes Level 3 support from the engineers who build the platform.

How It Fits Together

Your Billing System, Layer by Layer

Each layer can be your own team, a plugin or a partner.

Your applicationsWebsite, app, CRM, ERP

Call the Kill Bill REST API and receive events by push notification.

AviateEnterprise offering

AviateCatalog editor, coupons, prepaid credits, metering, tax rates, health, Level 3 support

Kill Bill coreOpen source, Apache 2.0

Kill Bill

KauiSubscriptions, usage, invoices, payments, multi-tenancy

Payment pluginsOpen source

Stripe

BraintreeHyperswitch

Forte ACH

Tax pluginsOpen source

Kintsugi

Custom pluginsYour rules

Written by your team, or by a partner such as

Hosting and testingWhere it runs

Your cloud

KubernetesChaChing (hosted)Bill Rush (distribution)Numerio QA Suite (tests)

Which Partner

Which Partner for Which Need?

Need	Partner	Type
Kill Bill without running servers	ChaChing	Deployment
Custom plugins and integrations	Wovenware	Integration
Sales tax and e-invoicing	Avalara	Ecosystem
ACH payments	Forte	Ecosystem
Automated billing tests	Numerio	Ecosystem
A supported Kill Bill distribution on Kubernetes	Bill Rush	Channel
Enterprise features and Level 3 support	Aviate	Kill Bill team

Plugins

Payment and Tax Plugins

Ready-made plugins connect Kill Bill to payment gateways and tax engines. For any other provider, you or a partner can write a plugin.

Payment plugins

Stripe
Cards, SEPA Direct Debit and Stripe Checkout.
Learn more
Adyen
Payments through the Adyen gateway.
Learn more
Braintree
Cards with or without 3D Secure, PayPal and ACH.
Learn more
Hyperswitch
Routes payments to the gateways that Hyperswitch connects to.
Learn more
Forte
ACH payments through the Forte Advanced Gateway Interface.
Learn more

Tax plugins

Avalara AvaTax
Sales and use tax on each invoice, with tax codes and exemptions set in Kaui.
Learn more
Vertex
Tax calculation with Vertex on each invoice.
Learn more
Kintsugi
Sales tax calculation with Kintsugi on each invoice.
Learn more

Aviate Tax adds tax rates per country and per product, without a third-party tax engine. Tax compliance

See all plugins on the Plugins and integrations page.

ChaChing

Deployment

Hosted Kill Bill platform partner

ChaChing operates the Kill Bill Hosted Platform, providing a fully managed way to run Kill Bill for startups and SMBs. Companies get access to the full Kill Bill billing engine without managing infrastructure, databases, or application servers.

Hosted Kill Bill infrastructure

Onboarding and operations

Customization support

Compatibility with the Kill Bill ecosystem

Explore the platform → ChaChing

Wovenware

Integration

Software engineering partner for Kill Bill plugins and customization

At Kill Bill, we understand that you may not have the in-house resources to develop the plugins to transform Kill Bill into your customized billing system.

That is why we partner with Wovenware, a software engineering firm, to help you determine which plugins or other customizations you would need to run Kill Bill for your business.

Contact Partner

Avalara

Ecosystem

Tax and e-invoicing partner, with the AvaTax plugin

The open source AvaTax plugin calculates sales and use tax on Kill Bill invoices. Product tax codes and account exemptions can be set in Kaui. Avalara also works with Kill Bill on e-invoicing, such as Factur-X.

The plugin connects Kill Bill to AvaTax, so tax is computed each time an invoice is generated.

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Forte

Ecosystem

Scale your business and get to market faster with a complete payments platform.

We have partnered with the team at Forte and have integrated their Advanced Gateway Interface (AGI) into Kill Bill. You can add an ACH option to your checkout flow.

Your e-commerce integration with Kill Bill stays the same, and Forte handles the ACH mechanics.

Contact Partner

Numerio

Ecosystem

Kill Bill QA Suite, a testing tool built specifically for Kill Bill

Numerio's Kill Bill QA Suite is a testing tool built specifically for the Kill Bill billing platform, offering ready-made domain actions, invoice/tax validations, and a drag-and-drop UI for composing business-scenario tests. It supports CI-integration, can be deployed on-premise or in private cloud, and keeps pace with Kill Bill releases to reduce test maintenance.

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Bill Rush

Channel

Commercially supported Kill Bill distribution on Kubernetes

Bill Rush is a fully managed, commercially supported Kill Bill distribution that runs on a Kubernetes cluster.

The Bill Rush platform is self-contained. It adds an Angular administrative portal, a document archive, SSO and identity management, an integration framework, automated tenant onboarding, and a billing operations center that monitors and manages one or more billing clusters.

Contact Partner

Billing Plugins, API and Integrations Extend Kill Bill with Java plugins for payments, tax and notifications, integrate through the REST API and push notifications, without forking the core. Stripe Integration for Subscription Billing Use Stripe as the payment gateway for Kill Bill: Stripe Checkout, cards and SEPA Direct Debit, through an open source plugin maintained by the Kill Bill team. Migrating to Kill Bill: Approach and Steps How to move billing to Kill Bill without downtime: run both systems, switch new accounts first, then migrate existing accounts in batches. Kill Bill API and Client Libraries The Kill Bill REST API: authentication, a first call in six languages, calls from catalog to invoice, client libraries, webhooks and the MCP server.

FAQs

Partners FAQ

Does the Kill Bill team build custom plugins?

No. The Kill Bill team builds and maintains the platform. For custom plugins and integrations, work with a partner such as Wovenware, or with your own team. Aviate, the enterprise offering of Kill Bill, includes Level 3 support from the engineers who build the platform.

Is there a hosted version of Kill Bill?

Yes. ChaChing operates a hosted Kill Bill platform, so you do not manage servers, databases or application servers. You can also run Kill Bill yourself, in your own cloud or data center.

Which tax engines work with Kill Bill?

Open source plugins exist for Avalara AvaTax, Vertex and Kintsugi. Avalara is also a Kill Bill partner for e-invoicing. Aviate Tax adds tax rates per country and per product.

Which payment gateways work with Kill Bill?

Open source plugins exist for Stripe, Adyen, Braintree and Hyperswitch, and Forte has integrated its ACH gateway with Kill Bill. You can write a plugin for any other gateway.

How do I test a Kill Bill implementation?

Kill Bill provides a test framework, and Numerio offers the Kill Bill QA Suite, a testing tool built for Kill Bill with ready-made actions, invoice and tax checks, and CI integration.

How do I become a Kill Bill partner?

Contact the Kill Bill team through the contact page and describe what you build or sell around Kill Bill.