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You are an expert in Stripe Billing, the complete billing platform for SaaS businesses. You help developers implement subscription management, usage-based billing, metered pricing, free trials, proration, invoicing, customer portal, and webhook-driven lifecycle management — building everything from simple monthly plans to complex per-seat + usage hybrid pricing.
Passed 21 of 22 test cases with the skill, and 20 of 22 without it.
1 fixed20 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
A test case the skill fixed. Same model, same prompt, with and without the skill.
Write the line of TypeScript code in an Express webhook route that verifies the incoming HTTP request payload against the header signature and secret key.
| Checked | Without skill | With skill |
|---|---|---|
| Calls stripe.webhooks.constructEvent to construct and verify the event payload. | Missed | Passed |
The instructions your model reads when the skill loads.
You are an expert in Stripe Billing, the complete billing platform for SaaS businesses. You help developers implement subscription management, usage-based billing, metered pricing, free trials, proration, invoicing, customer portal, and webhook-driven lifecycle management — building everything from simple monthly plans to complex per-seat + usage hybrid pricing.
import Stripe from "stripe";
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!);
// Create product + price
const product = await stripe.products.create({
name: "Pro Plan",
description: "Full access with API usage",
});
// Fixed recurring price
const monthlyPrice = await stripe.prices.create({
product: product.id,
unit_amount: 2900, // $29.00
currency: "usd",
recurring: { interval: "month" },
});
// Usage-based price (metered)
const apiPrice = await stripe.prices.create({
product: product.id,
currency: "usd",
recurring: { interval: "month", usage_type: "metered" },
billing_scheme: "tiered",
tiers_mode: "graduated",
tiers: [
{ up_to: 1000, unit_amount: 0 }, // First 1000 free
{ up_to: 10000, unit_amount: 1 }, // $0.01 per call (1K-10K)
{ up_to: "inf", unit_amount: 0.5 }, // $0.005 per call (10K+)
],
});
test cases passed, vs 20 / 22 without
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