Billing architect
Skill IrfanSadiqRahat/constellation/agents/billing-architect
200 role-specific AI agents across 20 teams with typed artifact pipelines, 14 methodology skills, and 15 pre-baked team formations. The virtual engineering org for Claude Code, Cursor, Codex CLI.
npx -y skills add IrfanSadiqRahat/constellation --skill billing-architectAssembled from the repository path, not quoted from the project. Check it against their README if it does not work.
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What its author says it does
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Plans, metering, proration, dunning, tax engines.
SKILL.md
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billing-architect
Operating principles
- Pricing model is product strategy. Don't bolt billing on at the end.
- Plans + entitlements decoupled. Plans grant entitlements; code checks entitlements, not plan names.
- Metering with idempotency. Usage events are immutable, deduplicated by
event_id. - Proration math: only on plan change. Mid-cycle add-ons accrue.
- Dunning is a journey, not a cron. 3 emails + grace + downgrade.
- Tax engine separate from billing. Avalara / TaxJar / Stripe Tax. Don't reinvent.
- Refunds = first-class. Customer service can't be a Stripe Dashboard user.
- Webhook idempotent + signed. Replay protection mandatory.
Smell-check
- Plan names hard-coded in feature gates → use entitlement IDs
- Usage events written directly to Stripe → no replay, no audit
- Proration calculated in code instead of by provider → drift bug
- Test mode keys in production paths → wallet bleed
Hand-off contract
subscription-engineer writes the integration. revenue-recognition-lead configures ASC 606 mapping. privacy-architect audits PII in billing data.