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ClaudSkills / Security / security-misc

Payments Domain Reference

Category: Security  ·  Sub-category: security-misc  ·  Last updated:
Payments-domain theory as implemented in THIS repo. Load when you hit unfamiliar payments jargon, need to reason about message/crypto correctness, OR are ADDING or extending a field table, dialect/MessageFormat, simulator decision rule, or HSM host command (extension-point maps included): ISO 8583 (MTI, bitmaps, DEs, LLVAR/LLLVAR, dialects/MessageFormats), EMV (BER-TLV, DOL, ARQC/ARPC, MDK/UDK/session keys, AIP/TVR/TSI), PIN security (ISO 9564 PIN blocks, PVV, CVV/CVV2), DUKPT (BDK/IPEK/KSN), HSM concepts (LMK, key tokens, payShield host commands — 15 implemented, e.g. NC/A0/KQ/G0), scheme flows (authorization vs clearing vs reversal vs network management, VISA Base I, CyberSource /pts/v2). Keywords: MTI, bitmap, data element, DE 55, TLV, cryptogram, ARQC, PIN block, KSN, LMK, key check value, KCV, STAN, RRN, Base I, STIP, retail MAC, track 2.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Ground rules for reading this file:

What this skill does

Payments Domain Reference is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/payments-domain-reference/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Payments Domain Reference Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 213,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/payments-domain-reference
curl -L https://claudskills.com/skills/payments-domain-reference/SKILL.md \
  -o ~/.claude/skills/payments-domain-reference/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/payments-domain-reference/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/payments-domain-reference/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\payments-domain-reference\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Payments Domain Reference Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/payments-domain-reference/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Payments Domain Reference skill do?
Payments-domain theory as implemented in THIS repo. Load when you hit unfamiliar payments jargon, need to reason about message/crypto correctness, OR are ADDING or extending a field table, dialect/MessageFormat, simulator decision rule, or HSM host command (extension-point maps included): ISO 8583 (MTI, bitmaps, DEs, LLVAR/LLLVAR, dialects/MessageFormats), EMV (BER-TLV, DOL, ARQC/ARPC, MDK/UDK/session keys, AIP/TVR/TSI), PIN security (ISO 9564 PIN blocks, PVV, CVV/CVV2), DUKPT (BDK/IPEK/KSN), HSM concepts (LMK, key tokens, payShield host commands — 15 implemented, e.g. NC/A0/KQ/G0), scheme flows (authorization vs clearing vs reversal vs network management, VISA Base I, CyberSource /pts/v2). Keywords: MTI, bitmap, data element, DE 55, TLV, cryptogram, ARQC, PIN block, KSN, LMK, key check value, KCV, STAN, RRN, Base I, STIP, retail MAC, track 2.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Payments Domain Reference skill?
Use Payments Domain Reference when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Payments Domain Reference" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Payments Domain Reference skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Payments Domain Reference is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
pay-probe. (2026). Payments Domain Reference [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/payments-domain-reference/
BibTeX
@misc{payments-domain-reference-2026,
  author    = {pay-probe},
  title     = {Payments Domain Reference [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/payments-domain-reference/}
}

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Security scan

Grade A · scanned 2026-11-01 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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