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 RevenueCat/play-billing-skills --skill one-time-productsgit clone --depth 1 https://github.com/RevenueCat/play-billing-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/revenuecat/play-billing-skills/one-time-products)<a href="https://agentmods.dev/skills/revenuecat/play-billing-skills/one-time-products"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/one-time-products/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/revenuecat/play-billing-skills/one-time-products"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/one-time-products.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 | $0.00051 | $0.02483 |
| Opus 5 | $0.00026 | $0.01241 |
| Sonnet 5 | $0.00010 | $0.00497 |
| Haiku 4.5 | $0.00005 | $0.00248 |
Grade A, and why
one-time-products 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 12d 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 — 322 lines — stays where its author put it; the contents beside it link to each section on GitHub.
One Time Products
Build a complete Google Play one time product integration with Play Billing Library 9.x. This skill walks through the full lifecycle: querying, launching, handling pending state, and finishing with either consume or acknowledge.
Phase 0: Intent
Confirm what you are building before writing code. Answer these questions:
- What product type is this? Consumable (repeatable like coins) or non consumable (one time like remove ads)?
- Where does fulfillment happen? Server side verification plus server side consume or acknowledge is the reliable pattern. Client side is acceptable only during early development.
- Which PBL version is the app on? PBL 9.x is assumed. Pending purchases for one time products are enabled explicitly by passing
PendingPurchasesParams.newBuilder().enableOneTimeProducts()toenablePendingPurchases()(required since PBL 8.0; the parameterless overload was removed in 8.0). - Do you need multi quantity, pre order, or multiple offers on the same product?
If any answer is unclear, stop and gather the requirements. Do not ship a purchase flow with ambiguous fulfillment rules.
Phase 1: Discovery
Gather the facts that drive the implementation.
| Discovery item | Where to find it |
|---|---|
| Product IDs | Play Console, Monetize > Products > In-app products |
| Product state | Must be Active before the app can query or sell |
| Pricing and availability | Play Console product page |
| Tax category | Play Console product page |
| PBL version | App's build.gradle billing dependency |
| Backend verification endpoint | Your server code or API spec |
| RTDN subscription | Cloud Pub/Sub topic for ONE_TIME_PRODUCT_PURCHASED and ONE_TIME_PRODUCT_CANCELED |
Choose naming up front. Good patterns: coins_100, remove_ads, level_pack_desert. Avoid product_1 or item_a. Product IDs are permanent and cannot be reused after deletion.
Phase 2: Plan
Decide consumable vs non consumable. The choice drives which API you call after granting entitlement.
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.
- 12d ago First seen · 322 lines · 51 tokens per session scan A 573518d7266f
one-time-products is a skill published in the GitHub repository RevenueCat/play-billing-skills (53 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 51 tokens to every session and 2,483 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 2026-08-30.
Other skills, from other repositories
play-billing-library-version-upgrade
Use this skill when upgrading or migrating an Android project from any legacy Google Play Billing Library (PBL) version to the latest stable version of PBL.
asc-revenuecat-catalog-sync
Reconcile App Store Connect subscriptions and in-app purchases with RevenueCat products, entitlements, offerings, and packages using asc and RevenueCat MCP. Use when setting up or syncing subscription catalogs across ASC and RevenueCat.
axiom-implement-iap
Use when the user wants to add in-app purchases, implement StoreKit 2, or set up subscriptions.
google-play
Google Play Developer API (Android Publisher) integration with managed OAuth. Manage apps, subscriptions, in-app purchases, and reviews. Use this skill when users want to interact with Google Play Console programmatically. For other third party apps, use the api-gateway skill (https://clawhub.ai/byungkyu/api-gateway).
subscription-lifecycle
Generates StoreKit 2 subscription lifecycle management — grace periods, billing retry, offer codes, win-back offers, upgrade/downgrade paths, and subscription status monitoring. Use when user needs post-purchase subscription state handling beyond the initial paywall.
subscription-offers
Generates StoreKit 2 code for all subscription offer types — introductory, promotional, offer codes, and win-back. Includes eligibility checks, offer presentation, and the preferredSubscriptionOffer modifier. Use when adding subscription offers, free trials, or promotional pricing.