What is audit-monetization-iap?

A read-only check of in-app purchases and subscriptions on Apple or Google mobile stores. It covers whether receipts and paid access are handled correctly.

Use it to review purchase validation, restoring purchases after reinstall, subscription changes, refunds, grace periods, and access rights.

It helps find cases where customers lose purchases, receive access without paying, or are charged incorrectly.

audit-monetization-iap — Skill for Claude Code and Codex by kensaurus

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.

Any agent

npx skills add kensaurus/cursor-kenji --skill audit-monetization-iap

Clone the repo

git clone --depth 1 https://github.com/kensaurus/cursor-kenji

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/kensaurus/cursor-kenji/audit-monetization-iap.svg)](https://agentmods.dev/skills/kensaurus/cursor-kenji/audit-monetization-iap)

Your own site

<a href="https://agentmods.dev/skills/kensaurus/cursor-kenji/audit-monetization-iap"><img src="https://agentmods.dev/badge/skills/kensaurus/cursor-kenji/audit-monetization-iap.svg" alt="Measured on agentmods" height="20"></a>

Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,261 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.

Model	Per session	Once invoked
Fable 5.1	$0.00075	$0.01261
Opus 5	$0.00037	$0.00630
Sonnet 5	$0.00015	$0.00252
Haiku 4.5	$0.00007	$0.00126

Measured 5d ago against content hash 48befa01a072, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

audit-monetization-iap 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.

skills/audit-monetization-iap/SKILL.md · 137 lines

How it starts

The opening of the file, as written. The whole thing — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.

audit-monetization-iap — Store billing & entitlements

Degree of freedom: MIXED — Phases 0–1 [HIGH freedom]; Phase 2 sandbox [LOW freedom — run exactly]. Never test against real billing.

Read-only. Entitlements must match what users paid for: no unlock-without-pay, no paid-but-locked, no double-charge, no lost purchase on reinstall.

The two revenue killers are client-trusted entitlements (piracy) and broken restore (refunds + 1-star reviews).

Present findings. Do not patch store/server code until approved. Never test against real billing.

This skill vs neighbors

Skill	Owns
audit-monetization-iap (this)	App Store / Play IAP, restore, store notifications
`audit-payment-system`	Web money-movement, Stripe, ledgers, PCI
`plan-mobile-readiness`	Submission paperwork (IAP via official billing is a checkbox)
`plan-aso`	Store listing conversion, not receipt validation
`plan-privacy-compliance`	Purchase-data in privacy labels

Do not fire for "Stripe webhook / double charge on the website" → audit-payment-system.

How to reason

Observe — quote where "is Pro?" is decided and whether a receipt/token is verified server-side
Interpret — can a client lie, or can a paid user lose access?
Classify — client-trust / missing restore / lifecycle hole / correct
Severity — client-trusted entitlement or broken restore = Critical

Worked example

Observe: isPro reads RevenueCat.getCustomerInfo() on-device only; no App Store Server Notification handler. Interpret: a patched client can unlock Pro; refunds never revoke. Classify: client-trust + missing lifecycle sync. Severity: Critical. Finding: entitlements | client-only | Critical | lib/pro.ts:18 | verify on server + ASN V2 / RTDN

Phase 0 — Detect the billing setup [HIGH freedom]

Layer: raw StoreKit 2 / Play Billing, or RevenueCat / Adapty / Glassfy
Entitlement check: client-only vs server-verified
Backend store of subscription state vs trust-the-SDK-at-runtime
Products: consumable, non-consumable, auto-renewing sub, trial / intro

Read the full file on GitHub · 137 lines

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.

5d ago First seen · 137 lines · 75 tokens per session scan A 48befa01a072

Subscribe to this mod's changes

audit-monetization-iap is a skill published in the GitHub repository kensaurus/cursor-kenji (9 stars, last pushed 10d ago), licensed MIT. It adds 75 tokens to every session and 1,261 once invoked, about $0.0004 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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