Borrowing it
Nothing to install: this file belongs to irahardianto/rugged-gemini. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/irahardianto/rugged-gemini/main/.gemini/skills/payment-integration/SKILL.mdgit clone --depth 1 https://github.com/irahardianto/rugged-geminiWrote 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/irahardianto/rugged-gemini/payment-integration)<a href="https://agentmods.dev/skills/irahardianto/rugged-gemini/payment-integration"><img src="https://agentmods.dev/badge/skills/irahardianto/rugged-gemini/payment-integration/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/irahardianto/rugged-gemini/payment-integration"><img src="https://agentmods.dev/badge/skills/irahardianto/rugged-gemini/payment-integration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00029 | $0.00639 |
| Opus 5 | $0.00015 | $0.00319 |
| Sonnet 5 | $0.00006 | $0.00128 |
| Haiku 4.5 | $0.00003 | $0.00064 |
Grade A, and why
payment-integration 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 5d 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.
This is a copy
88% identical to payment-integration — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Payment Integration Principles
Guidelines for building secure, compliant payment systems.
When to Invoke
- Integrating payment gateways (Stripe, Adyen, etc.)
- PCI compliance requirements
- Subscription/billing system design
- Fraud prevention implementation
Security (Non-Negotiable)
PCI DSS Compliance
- Never store raw card data — use tokenization via gateway.
- Never log payment credentials — mask card numbers, CVV never stored.
- TLS everywhere — all payment communication over HTTPS.
- Minimal data retention — store only what's legally required.
Tokenization Flow
User → Client-side SDK (Stripe.js/Elements) → Gateway tokenizes → Token to your server → Server charges via token
Your server never sees raw card data.
Transaction Patterns
Idempotency (Critical)
POST /api/payments
Idempotency-Key: unique-request-id-abc123
→ Gateway processes once, returns same result on retry
- Generate idempotency key client-side or server-side
- Store key → result mapping for deduplication
- Retry-safe — network failures don't cause double charges
Authorization Flow
Authorize → Capture → Settle
→ Void (cancel before capture)
→ Refund (after capture)
Webhook Handling
- Verify webhook signatures — never trust unverified payloads.
- Idempotent processing — webhooks may be delivered multiple times.
- Queue webhooks — process asynchronously, acknowledge immediately (200 OK).
- Handle out-of-order delivery — use event timestamps, not arrival order.
Subscription Billing
Lifecycle
Trial → Active → Past Due (dunning) → Cancelled/Expired
→ Upgraded/Downgraded (proration)
Dunning Management
- Retry failed payments (exponential backoff: day 1, 3, 7, 14)
- Notify user before and after each retry
- Grace period before cancellation
Fraud Prevention
- 3D Secure (SCA) for European payments (PSD2 requirement).
- Address Verification (AVS) — match billing address.
- Velocity checks — rate-limit transactions per user/IP.
- Risk scoring — use gateway's built-in fraud tools.
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.
- 5d ago First seen · 89 lines · 29 tokens per session scan A 8dacdb30cabc
payment-integration is a skill published in the GitHub repository irahardianto/rugged-gemini (5 stars, last pushed 4mo ago), licensed MIT. It adds 29 tokens to every session and 639 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to payment-integration, differing in 8 lines, and is treated as a copy.
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