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 agentmods add skills/fullstack-phoenix/saas_kit/stripe-subscriptionnpx skills add fullstack-phoenix/saas_kit --skill stripe-subscriptiongit clone --depth 1 https://github.com/fullstack-phoenix/saas_kitWhat 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 | $0.00041 | $0.00992 |
| Opus 5 | $0.00020 | $0.00496 |
| Sonnet 5 | $0.00008 | $0.00198 |
| Haiku 4.5 | $0.00004 | $0.00099 |
Grade A, and why
stripe-subscription 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 2d 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 — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Stripe Subscription
Adds a MyApp.Billing.StripeSubscription provider that creates Stripe-hosted
Checkout sessions for recurring subscriptions over Req. It only mints checkout
URLs — it does not record subscription state. Treat a redirect to success_url
as "checkout started", not "paid": grant access from verified Stripe webhooks.
When to use
- The app needs recurring (subscription) billing and you want Stripe to host the payment page rather than building a card form.
- You want a thin billing facade (
MyApp.Billing) you can swap providers behind. - Don't reach for this if you need one-time payments only, or if you already have a webhook-backed billing flow — this is a starting point, not a complete system.
Dependencies
- Requires:
authentication(sessions are created from a user's email). - Recommended: None.
Install
mix saaskit.feature.install stripe_subscription
No installer decisions. It generates the provider module and injects billing
config into config/runtime.exs.
What it generates
lib/my_app/billing/stripe_subscription.ex— the provider. Implements theMyApp.Billingbehaviour withcreate_checkout_session/2, POSTs to Stripe's/v1/checkout/sessionsinmode=subscription, and returns{:ok, url}or{:error, reason}.
Configuration
Injected after import Config in config/runtime.exs:
# config/runtime.exs
config :my_app, :billing,
provider: MyApp.Billing.StripeSubscription
config :my_app, MyApp.Billing.StripeSubscription,
secret_key: System.get_env("STRIPE_SECRET_KEY"),
price_id: System.get_env("STRIPE_SUBSCRIPTION_PRICE_ID")
STRIPE_SECRET_KEY— your Stripe API secret. Keep it out of source control.STRIPE_SUBSCRIPTION_PRICE_ID— the ID of a recurring Price created in Stripe. The provider errors with{:missing_configuration, key}if either is blank, so set both before calling checkout.
Tweaking for your app
Create a session and redirect the user to Stripe:
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.
- 2d ago First seen · 115 lines · 41 tokens per session scan A 61f18577fc21
stripe-subscription is a skill published in the GitHub repository fullstack-phoenix/saas_kit (2 stars, last pushed 2mo ago), licensed MIT. It adds 41 tokens to every session and 992 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 2026-08-31.
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