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 alternative-billinggit 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/alternative-billing)<a href="https://agentmods.dev/skills/revenuecat/play-billing-skills/alternative-billing"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/alternative-billing/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/alternative-billing"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/alternative-billing.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 | $0.00061 | $0.02274 |
| Opus 5 | $0.00030 | $0.01137 |
| Sonnet 5 | $0.00012 | $0.00455 |
| Haiku 4.5 | $0.00006 | $0.00227 |
Grade A, and why
alternative-billing 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 — 269 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Alternative Billing and External Offers
Google Play exposes several programs that let you present payment paths outside Google Play billing. This skill walks you through picking the right program for your region, wiring the PBL APIs, and reporting transactions to the externaltransactions API within 24 hours.
Phase 1: Discovery
Confirm program eligibility before you touch any code. Eligibility is driven by region, product type, and Play Console enrollment.
Check enrollment
- Open Play Console and confirm you accepted the program terms for each program you plan to use.
- Register external URLs, subscription management links, and countries per program.
- Record the PBL version in your
build.gradle. Features map to PBL versions:
| Program | Minimum PBL |
|---|---|
| User choice billing | 5.2 (6.1 renamed APIs) |
| Alternative billing only | 6.1 |
| External offers (unified API) | 8.2.1 |
| External content links | 8.2.1 |
| External payment links | 8.3.0 |
Map regions to programs
| Region | Available programs |
|---|---|
| South Korea | User choice billing |
| EEA | User choice billing, alternative billing only, external offers, external content links, external payment links |
| India | User choice billing |
| United States | User choice billing, external content links, external payment links |
Check runtime availability
Do not hard code country lists. The PBL surfaces eligibility.
billingClient.isBillingProgramAvailableAsync(
BillingProgram.EXTERNAL_OFFER,
listener
)
For alternative billing only, use isAlternativeBillingOnlyAvailableAsync(). A BILLING_UNAVAILABLE result means the user or account is ineligible.
Discovery questions to answer
- Which program(s) does your app need per region?
- Do you serve subscriptions, one time products, or both?
- Is PBL at a version that supports the target program?
- Does your backend have a job that can report transactions within 24 hours?
Phase 2: Plan
Pick the program variant that matches your goals and region coverage.
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 · 269 lines · 61 tokens per session scan A eea520d668a6
alternative-billing is a skill published in the GitHub repository RevenueCat/play-billing-skills (53 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 61 tokens to every session and 2,274 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.
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