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 hamzabellouch/agent-skills --skill payment-gateways-stripe-adyen-integrationgit clone --depth 1 https://github.com/hamzabellouch/agent-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/hamzabellouch/agent-skills/payment-gateways-stripe-adyen-integration)<a href="https://agentmods.dev/skills/hamzabellouch/agent-skills/payment-gateways-stripe-adyen-integration"><img src="https://agentmods.dev/badge/skills/hamzabellouch/agent-skills/payment-gateways-stripe-adyen-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/hamzabellouch/agent-skills/payment-gateways-stripe-adyen-integration"><img src="https://agentmods.dev/badge/skills/hamzabellouch/agent-skills/payment-gateways-stripe-adyen-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 | $0.00053 | $0.03045 |
| Opus 5 | $0.00026 | $0.01522 |
| Sonnet 5 | $0.00011 | $0.00609 |
| Haiku 4.5 | $0.00005 | $0.00304 |
Grade A, and why
payment-gateways-stripe-adyen-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 9d 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 — 317 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Payment Gateways Integration Architecture (Stripe & Adyen)
This skill package provides enterprise-grade patterns, architectural principles, PCI-DSS v4.0 compliance guidelines, and production code implementations for orchestrating payment processing across Stripe and Adyen.
1. Core Architectural & Compliance Standards
PCI-DSS v4.0 Compliance & Tokenization
- Out-of-Scope Architecture (SAQ A / SAQ A-EP): Never ingest, process, or store Raw Primary Account Numbers (PAN), Card Verification Values (CVV/CVC), or PINs on your infrastructure. Use client-side SDKs (Stripe Elements / Adyen Web Drop-in) to tokenization endpoints directly owned by payment service providers (PSPs).
- Network & Transport Layer Security: All API endpoints and client SDK communications must enforce TLS 1.3 with strong cipher suites (e.g.,
TLS_AES_256_GCM_SHA384). - Data Sanitization & Zero Logging: Redact all sensitive fields from application logs, trace contexts, and error payloads. Never log header signatures, API tokens, raw webhook payloads with PII, or tokens susceptible to account takeover.
Webhook Idempotency & Replay Protection
- Idempotency Keying: Webhook events must be processed exactly once using distributed locking (e.g., Redis
SET key value NX PX) keyed by the unique Event ID (event.idfor Stripe,eventCode+pspReferencefor Adyen). - Time-Window & Signature Verification: Reject webhooks missing cryptographic HMAC signatures or with timestamps older than 300 seconds to prevent replay attacks.
- Asynchronous Execution: Webhook HTTP handlers must validate signatures, enqueue the event into an isolated message queue (e.g., Kafka / RabbitMQ), and return an immediate HTTP
200 OKwithin 500ms to avoid PSP retry loops.
Reconciliation & Ledger Architecture
- Double-Entry Bookkeeping: Model payments as state transitions across double-entry ledger accounts (Asset: PSP Clearing, Revenue, Expense: Gateway Fees, Liability: Customer Balance).
- State Machine Integrity: Enforce strict status transitions (
AUTHORIZED->CAPTURED->SETTLED/REFUNDED/DISPUTED).
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.
- 9d ago First seen · 317 lines · 53 tokens per session scan A fb748eb16eae
payment-gateways-stripe-adyen-integration is a skill published in the GitHub repository hamzabellouch/agent-skills (4 stars, last pushed 1mo ago), licensed MIT. It adds 53 tokens to every session and 3,045 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 2026-09-03.
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