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Rei-skills billing-automation

Build automated billing systems for recurring payments, invoicing, subscription lifecycle, and dunning management. Use when implementing subscription billing, automating invoicing, or managing recu...

install
source · Clone the upstream repo
git clone https://github.com/rootcastleco/rei-skills
Claude Code · Install into ~/.claude/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/rootcastleco/rei-skills "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/billing-automation" ~/.claude/skills/rootcastleco-rei-skills-billing-automation && rm -rf "$T"
manifest: skills/billing-automation/SKILL.md
source content

Billing Automation

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

Use this skill when

  • 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

Do not use this skill when

  • You only need a one-off invoice or manual billing
  • The task is unrelated to billing or subscriptions
  • You cannot change pricing, plans, or billing flows

Instructions

  • Define plans, pricing, billing intervals, and proration rules.
  • Map subscription lifecycle states and renewal/cancellation behavior.
  • Implement invoicing, payments, retries, and dunning workflows.
  • Model taxes and compliance requirements per region.
  • Validate with sandbox payments and reconcile ledger outputs.
  • If detailed templates are required, open 
    resources/implementation-playbook.md
    .

Safety

  • Do not charge real customers in testing environments.
  • Verify tax handling and compliance obligations before production rollout.

Resources

  • resources/implementation-playbook.md
    for detailed patterns, checklists, and examples.

🏰 Rei Skills — Curated by Rootcastle Engineering & Innovation | Batuhan Ayrıbaş
Engineering Beyond Boundaries | admin@rootcastle.com