Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add whawkinsiv/solo-founder-skills --skill paymentsgit clone --depth 1 https://github.com/whawkinsiv/solo-founder-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/whawkinsiv/solo-founder-skills/payments)<a href="https://agentmods.dev/skills/whawkinsiv/solo-founder-skills/payments"><img src="https://agentmods.dev/badge/skills/whawkinsiv/solo-founder-skills/payments/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/whawkinsiv/solo-founder-skills/payments"><img src="https://agentmods.dev/badge/skills/whawkinsiv/solo-founder-skills/payments.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00065 | $0.02008 |
| Opus 5 | $0.00032 | $0.01004 |
| Sonnet 5 | $0.00013 | $0.00402 |
| Haiku 4.5 | $0.00006 | $0.00201 |
Grade A, and why
payments scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 236 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Payments & Billing Operations
Billing is 20% code and 80% configuration and business decisions. This skill helps you set up Stripe correctly, handle the edge cases, and avoid the mistakes that lose customer trust.
Core Principles
- Stripe is the right choice for 95% of bootstrapped SaaS. Do not overthink this decision.
- Test mode exists for a reason. Never touch live mode until you've tested every flow.
- Billing is the one place you cannot "move fast and break things." A billing bug loses trust permanently.
- Automate everything. Manual invoicing doesn't scale and you will forget.
- Tax compliance is not optional. Set it up from day one.
Stripe Setup Checklist
Stripe Configuration:
- [ ] Create Stripe account and verify identity
- [ ] Enable test mode (toggle in top-right of dashboard)
- [ ] Set up products and prices in Stripe Dashboard (not in code)
- [ ] Configure Customer Portal (Settings -> Billing -> Customer portal)
- [ ] Enable Stripe Tax (Settings -> Tax)
- [ ] Set up webhook endpoint in your app
- [ ] Add Stripe keys to environment variables
- [ ] Test complete purchase flow (test card: 4242424242424242)
- [ ] Test failed payment (decline card: 4000000000000002)
- [ ] Test subscription cancellation and upgrade/downgrade flows
- [ ] Switch to live mode, re-add live API keys
- [ ] Make one real purchase with your own card to verify
Tell AI:
Set up Stripe subscription billing for my SaaS:
- Monthly and annual pricing tiers: [list your tiers and prices]
- Checkout flow using Stripe Checkout (hosted payment page)
- Customer Portal for managing subscriptions
- Webhook handler for subscription events
- Environment variables for Stripe keys
Use [your framework/stack].
Products & Prices: Dashboard First
Always create products and prices in the Stripe Dashboard. Then reference them by Price ID in your code.
How to Set Up
- Stripe Dashboard -> Products -> Create one Product per tier (e.g., "Starter", "Pro")
- Add two Prices per product — monthly and annual
- Copy the Price IDs (
price_...) into your app config - Use lookup keys for cleaner code (e.g.,
starter_monthly,pro_annual)
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 236 lines · 65 tokens per session scan A 9cf357e343e3
payments is a skill published in the GitHub repository whawkinsiv/solo-founder-skills (243 stars, last pushed 16d ago), licensed MIT. It adds 65 tokens to every session and 2,008 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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