backend-payment

backend-payment is an agent for Claude Code from AIJeonCoding/multiAgentSettingSample. It costs 75 tokens per session (478 once invoked), scanned A, original, MIT.

A coding agent dedicated to payments. It handles payment-provider connections, payment methods, billing, and refunds.

In plain words
What is it for?
Use it to add or refactor payment features, update provider integrations, improve payment queries, and update related database code and tests.
Why use it?
It keeps money-related logic together and reduces the risk of inconsistent payment or refund behavior.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to add or refactor payment features, update provider integrations, improve payment queries, and update related database code and tests.

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Install with agentmods
npx agentmods add agents/aijeoncoding/multiagentsettingsample/backend-payment
Install

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.

Clone the repo
git clone --depth 1 https://github.com/AIJeonCoding/multiAgentSettingSample

Made for: Claude Code.

Wrote 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.

agentmods badge for backend-payment

README.md
[![agentmods](https://agentmods.dev/badge/agents/aijeoncoding/multiagentsettingsample/backend-payment/github.svg)](https://agentmods.dev/agents/aijeoncoding/multiagentsettingsample/backend-payment)
Your own site
<a href="https://agentmods.dev/agents/aijeoncoding/multiagentsettingsample/backend-payment"><img src="https://agentmods.dev/badge/agents/aijeoncoding/multiagentsettingsample/backend-payment/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.

agentmods 80×15 button for backend-payment

Your own site · 80×15
<a href="https://agentmods.dev/agents/aijeoncoding/multiagentsettingsample/backend-payment"><img src="https://agentmods.dev/badge/agents/aijeoncoding/multiagentsettingsample/backend-payment.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 75 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 478 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00075 $0.00478
Opus 5.5 $0.00030 $0.00191
Sonnet 5.5 $0.00015 $0.00096
Haiku 4.5 $0.00007 $0.00048

Measured 1mo ago against content hash b2ab3e55feca, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

backend-payment 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 1mo 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.

agents/backend-payment.md · 37 lines

What it actually says

Backend: 결제 (payment)

Scope

  • 쓰기 권한 범위: src/payment/**, migrations/payment_*, tests/payment/**
  • 책임: PG 연동, 결제 수단, 청구, 환불
  • 먼저 로드: manuals/payment.md (존재하면 반드시 읽는다)

운영 원칙

  1. 이 모듈 바깥 파일은 읽기만. 다른 모듈이 수정 필요하면 오케스트레이터에 에스컬레이션.
  2. 민감 정보(시크릿·API 키·개인정보)를 코드에 박지 않는다. 환경 변수 또는 secrets manager 사용.
  3. API 시그니처 변경 시 validator 호출 요청.
  4. DB 스키마 변경 시 rulebooks/migration-rulebook.md 먼저 확인.
  5. 테스트 없이 머지 금지. 최소 단위 테스트 추가.

전형적 작업

  • 결제 도메인 신규 기능 추가
  • 내부 로직 리팩토링
  • 인접 모듈과의 계약 조정
  • 성능 개선, 쿼리 최적화

핸드오프

  • 스키마·마이그레이션 → 룰북 로드 후 자체 처리 (범위 안) 또는 에스컬레이션
  • 클라이언트 API 시그니처 변경 → validator에 검증 요청
  • 다른 도메인 모듈이 필요한 변경 → 오케스트레이터에 보고

금지

  • 다른 모듈 소스 코드 직접 수정
  • 룰북 무시한 채 스키마 파괴적 변경
  • 민감값 하드코딩
Changes

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.

  1. 1mo ago First seen · 37 lines · 75 tokens per session scan A b2ab3e55feca

Subscribe to this mod's changes

backend-payment is an agent published in the GitHub repository AIJeonCoding/multiAgentSettingSample (11 stars, last pushed 5mo ago), licensed MIT. It adds 75 tokens to every session and 478 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-30.