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 vasilyu1983/AI-Agents-public --skill software-paymentsgit clone --depth 1 https://github.com/vasilyu1983/AI-Agents-publicWrote 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/vasilyu1983/ai-agents-public/software-payments)<a href="https://agentmods.dev/skills/vasilyu1983/ai-agents-public/software-payments"><img src="https://agentmods.dev/badge/skills/vasilyu1983/ai-agents-public/software-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/vasilyu1983/ai-agents-public/software-payments"><img src="https://agentmods.dev/badge/skills/vasilyu1983/ai-agents-public/software-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 | $0.00033 | $0.03963 |
| Opus 5 | $0.00016 | $0.01982 |
| Sonnet 5 | $0.00007 | $0.00793 |
| Haiku 4.5 | $0.00003 | $0.00396 |
Grade A, and why
software-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 7d 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 — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Payments & Billing Engineering
Use this skill to design, implement, and debug production payment integrations: checkout flows, subscription lifecycle handling, billing portals, entitlement gating, webhooks, regional pricing, and payment-testing strategy.
Keep the skill focused on system choice and durable integration defaults. Push provider-specific code detail, migration edge cases, and deep implementation examples into the references.
Quick Reference
| Need | Default | Reference |
|---|---|---|
| SaaS subscriptions | Stripe Checkout or Payment Links | references/stripe-patterns.md |
| Custom branded checkout | Stripe Payment Element plus Express Checkout Element | references/stripe-patterns.md |
| Merchant of record | Paddle, LemonSqueezy, or Stripe Managed Payments when eligible | references/platform-comparison.md |
| Enterprise multi-method processing | Adyen | references/platform-comparison.md |
| UK or EU bank debit and local methods | GoCardless, Mollie, or open-banking providers | references/uk-eu-payments-guide.md |
| Usage or complex billing | Stripe Billing Meters, Chargebee, Recurly, or Lago | references/platform-comparison.md, references/subscription-lifecycle.md |
| Webhook reliability | verified signatures plus idempotent processing | references/webhook-reliability-patterns.md |
| Entitlement and feature gating | registry plus API enforcement plus UI paywall | references/feature-gating-patterns.md |
| Native iOS in-app purchase | StoreKit 2 with backend JWS verification; add RevenueCat only when multi-platform entitlement sync materially justifies it | references/storekit2-native-patterns.md |
| Checkout and webhook testing | Stripe CLI plus E2E automation | references/testing-patterns.md |
What ships with it
17 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- agents/openai.yaml 308 B
- assets/template-checkout-entrypoint-propagation-checklist.md 1.2 KB
- data/sources.json 31 KB
- evals/evals.json 9.4 KB
- learnings.consolidated.md 593 B
- learnings.md 593 B
- references/feature-gating-patterns.md 10 KB
- references/in-app-browser-checkout-contract.md 1.4 KB
- references/ops-runbook-checkout-errors.md 1.6 KB
- references/platform-comparison.md 16 KB
- references/regional-pricing-guide.md 23 KB
- references/storekit2-native-patterns.md 11 KB
- references/stripe-patterns.md 15 KB
- references/subscription-lifecycle.md 22 KB
- references/testing-patterns.md 4.1 KB
- references/uk-eu-payments-guide.md 12 KB
- references/webhook-reliability-patterns.md 25 KB
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.
- 7d ago First seen · 222 lines · 33 tokens per session scan A d3ef19b7cf01
software-payments is a skill published in the GitHub repository vasilyu1983/AI-Agents-public (87 stars, last pushed 8d ago), licensed MIT. It adds 33 tokens to every session and 3,963 once invoked, about $0.0002 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 2026-09-03.
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