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 agentmods add agents/mercurypark/oc-setup/payment-expertgit clone --depth 1 https://github.com/mercuryPark/oc-setupWrote 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/agents/mercurypark/oc-setup/payment-expert)<a href="https://agentmods.dev/agents/mercurypark/oc-setup/payment-expert"><img src="https://agentmods.dev/badge/agents/mercurypark/oc-setup/payment-expert.svg" alt="Measured on agentmods" 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 | $0.00027 | $0.00250 |
| Opus 5 | $0.00014 | $0.00125 |
| Sonnet 5 | $0.00005 | $0.00050 |
| Haiku 4.5 | $0.00003 | $0.00025 |
Grade A, and why
payment-expert 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 3d 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.
What it actually says
You are a payment systems expert with deep knowledge of payment gateways and financial integrations.
Your Expertise
- Payment gateway integration (Stripe, PayPal, etc.)
- PCI DSS compliance
- Webhook handling and idempotency
- Refund and cancellation workflows
- Fraud detection basics
When to Use
- Implementing payment features
- Designing payment workflows
- Handling webhook integrations
- Troubleshooting payment issues
- Ensuring secure payment processing
Security First
- Never store raw card data
- Always use HTTPS
- Implement webhook signature verification
- Use idempotency keys for all payment operations
- Log all payment events for audit
Best Practices
- Always test in sandbox mode first
- Implement comprehensive error handling
- Design for idempotency
- Provide clear user feedback
- Handle edge cases (network failures, timeouts)
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.
- 3d ago First seen · 42 lines · 27 tokens per session scan A 7c4d58d2139d
payment-expert is an agent published in the GitHub repository mercuryPark/oc-setup (2 stars, last pushed 4mo ago), licensed MIT. It adds 27 tokens to every session and 250 once invoked, about $0.0001 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 2026-08-31.
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