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 finsilabs/awesome-ecommerce-skills --skill subscription-billinggit clone --depth 1 https://github.com/finsilabs/awesome-ecommerce-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/finsilabs/awesome-ecommerce-skills/subscription-billing)<a href="https://agentmods.dev/skills/finsilabs/awesome-ecommerce-skills/subscription-billing"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/subscription-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/finsilabs/awesome-ecommerce-skills/subscription-billing"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/subscription-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 | $0.00032 | $0.02510 |
| Opus 5 | $0.00016 | $0.01255 |
| Sonnet 5 | $0.00006 | $0.00502 |
| Haiku 4.5 | $0.00003 | $0.00251 |
Grade A, and why
subscription-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 9d 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 — 224 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Subscription Billing
Overview
Subscription billing lets customers pay automatically on a recurring schedule — weekly, monthly, or annually. Shopify, WooCommerce, and BigCommerce each have dedicated subscription apps and plugins that handle the full lifecycle: initial checkout, recurring billing, failed payment recovery (dunning), plan changes, pausing, and cancellation. For headless storefronts, Stripe Subscriptions provides the same functionality via API with no need to build billing logic from scratch.
When to Use This Skill
- When building a subscription box, membership, or "Subscribe & Save" program
- When the current subscription logic is manual and not scaling with customer count
- When dunning (failed payment recovery) is not automated and causing unnecessary churn
- When customers need self-serve plan upgrades, downgrades, pausing, and cancellation
Core Instructions
Step 1: Determine your platform and choose the right subscription tool
| Platform | Recommended Tool | Notes |
|---|---|---|
| Shopify | Recharge or Seal Subscriptions or Bold Subscriptions (Shopify App Store) | Shopify has a native Subscriptions API; Recharge is the most widely used third-party app; Seal is a newer lower-cost option |
| Shopify (simple) | Shopify Subscriptions (built-in, free) | For basic subscription needs — launched 2024; handles simple recurring orders |
| WooCommerce | WooCommerce Subscriptions ($199/year, official WooCommerce extension) | The official and most complete WooCommerce subscription solution; handles all billing, dunning, and management |
| BigCommerce | Recurly (via BigCommerce App Marketplace) or Rebilly | BigCommerce does not have native subscriptions; third-party apps handle it |
| Custom / Headless | Stripe Subscriptions | Stripe Subscriptions handles the complete recurring billing lifecycle with webhooks |
Step 2: Set up subscriptions on your platform
What ships with it
7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- evals/dunning-emails-cancellation-and-webhook-/criteria.json 3.0 KB
- evals/dunning-emails-cancellation-and-webhook-/task.md 2.0 KB
- evals/plan-changes-with-proration-preview/criteria.json 2.3 KB
- evals/plan-changes-with-proration-preview/task.md 1.7 KB
- evals/subscription-creation-with-trial-and-db-/criteria.json 2.6 KB
- evals/subscription-creation-with-trial-and-db-/task.md 1.6 KB
- tile.json 242 B
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.
- 9d ago First seen · 224 lines · 32 tokens per session scan A 1aee6cf63d26
subscription-billing is a skill published in the GitHub repository finsilabs/awesome-ecommerce-skills (52 stars, last pushed 6mo ago), licensed MIT. It adds 32 tokens to every session and 2,510 once invoked, about $0.0002 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.
Other skills, from other repositories
Billing Manager
Manage billing operations including invoice generation, payment tracking, and subscription lifecycle.
subscription-management
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monetization
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Stripe Payments
Automate Stripe payment processing, subscription management, invoicing, and financial reporting.
stripekit
Add Stripe billing — subscriptions, checkout, and the customer portal — to an app by declaring a catalog in code and running the stripekit CLI. Use when a user wants to add payments, subscriptions, plans, pricing, checkout, or a billing portal with Stripe (especially in a Next.js app), or to manage Stripe…
monetization
Estrategia e implementacao de monetizacao para produtos digitais - Stripe, subscriptions, pricing experiments, freemium, upgrade flows, churn prevention, revenue optimization e modelos de negocio SaaS.