billing-automation

1# Billing Automation
2 
3Master automated billing systems including recurring billing, invoice generation, dunning management, proration, and tax calculation.
4 
5## Use this skill when
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7- Implementing SaaS subscription billing
8- Automating invoice generation and delivery
9- Managing failed payment recovery (dunning)
10- Calculating prorated charges for plan changes
11- Handling sales tax, VAT, and GST
12- Processing usage-based billing
13- Managing billing cycles and renewals
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15## Do not use this skill when
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17- You only need a one-off invoice or manual billing
18- The task is unrelated to billing or subscriptions
19- You cannot change pricing, plans, or billing flows
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21## Instructions
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23- Define plans, pricing, billing intervals, and proration rules.
24- Map subscription lifecycle states and renewal/cancellation behavior.
25- Implement invoicing, payments, retries, and dunning workflows.
26- Model taxes and compliance requirements per region.
27- Validate with sandbox payments and reconcile ledger outputs.
28- If detailed templates are required, open `resources/implementation-playbook.md`.
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30## Safety
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32- Do not charge real customers in testing environments.
33- Verify tax handling and compliance obligations before production rollout.
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35## Resources
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37- `resources/implementation-playbook.md` for detailed patterns, checklists, and examples.