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Billing Automation

Free

Streamline your recurring billing and invoicing processes.

by wshobson38.7k stars on wshobson/agents
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Updated Jul 18, 2026
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Free · Opens the source repo

What Billing Automation does

Billing Automation provides a comprehensive framework for managing automated billing systems, particularly for recurring payments and subscriptions. This skill is designed for developers and businesses looking to implement efficient billing solutions without the overhead of manual processes. It covers essential aspects such as invoice generation, subscription lifecycle management, and dunning management, enabling users to focus on their core business activities while ensuring timely revenue collection.

The skill supports various billing cycles, including monthly, annual, quarterly, and custom intervals, making it versatile for different business models, especially SaaS. Users can automate the entire subscription lifecycle, from trial to active status, and handle states like past_due, canceled, paused, and resumed seamlessly. This flexibility is crucial for businesses that need to adapt to customer needs and changes in subscription plans.

Dunning management is another critical feature of this skill, automating the recovery of failed payments through retry schedules and customer notifications. This reduces the manual effort required to manage payment failures and enhances customer experience by providing grace periods and account restrictions when necessary. Additionally, the skill includes capabilities for proration, allowing businesses to adjust charges when customers upgrade or downgrade their plans mid-cycle.

Overall, Billing Automation is an essential tool for any organization looking to simplify and automate their billing processes, ensuring accuracy and efficiency in managing recurring payments and invoicing.

When to use it

Use this skill when implementing subscription billing systems, automating invoicing, or managing customer payment lifecycles.

When not to use it

This skill may not be suitable for businesses with one-time payment models or those requiring highly customized billing solutions outside standard practices.

What you can build with it

SaaS Subscription Management

Easily implement subscription billing for your SaaS application, automating invoicing and payment recovery.

Automated Invoice Delivery

Set up automated invoice generation and delivery to customers, reducing manual workload and ensuring timely payments.

Handling Payment Failures

Utilize dunning management to automatically recover failed payments, enhancing cash flow and customer retention.

How to install Billing Automation

View source

1. Install with the skills CLI

npx skills add wshobson/agents/billing-automation --agent claude-code

2. Or install it manually

Download the skill folder and drop it into ~/.claude/skills/ for all projects, or .claude/skills/ to scope it to one repo. Restart Claude Code so it picks up the new skill.

Anthropic's agentic coding CLI, and the reference implementation of Agent Skills. Drop a skill folder into ~/.claude/skills and Claude Code loads it automatically whenever a task matches the skill's description. Claude Code docs

Inside SKILL.md

Written by wshobson

Billing Automation

Master automated billing systems including recurring billing, invoice generation, dunning management, proration, and tax calculation.

When to Use This Skill

  • Implementing SaaS subscription billing
  • Automating invoice generation and delivery
  • Managing failed payment recovery (dunning)
  • Calculating prorated charges for plan changes
  • Handling sales tax, VAT, and GST
  • Processing usage-based billing
  • Managing billing cycles and renewals

Core Concepts

1. Billing Cycles

Common Intervals:

  • Monthly (most common for SaaS)
  • Annual (discounted long-term)
  • Quarterly
  • Weekly
  • Custom (usage-based, per-seat)

2. Subscription States

trial → active → past_due → canceled
              → paused → resumed

3. Dunning Management

Automated process to recover failed payments through:

  • Retry schedules
  • Customer notifications
  • Grace periods
  • Account restrictions

4. Proration

Adjusting charges when:

  • Upgrading/downgrading mid-cycle
  • Adding/removing seats
  • Changing billing frequency

Quick Start

from billing import BillingEngine, Subscription

# Initialize billing engine
billing = BillingEngine()

# Create subscription
subscription = billing.create_subscription(
    customer_id="cus_123",
    plan_id="plan_pro_monthly",
    billing_cycle_anchor=datetime.now(),
    trial_days=14
)

# Process billing cycle
billing.process_billing_cycle(subscription.id)

Detailed patterns and worked examples

Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.

Frequently asked questions about Billing Automation

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