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webhook-implementation

webhook-implementation is a skill for Claude Code, Codex from appeeky/stripe-skills. It costs 65 tokens per session (345 once invoked), scanned A, original, MIT.

A guide for building Stripe webhook handlers. Webhooks are messages that Stripe sends to your application when events such as payments or subscription changes occur.

In plain words
What is it for?
Use it to add or repair handlers for checkout, subscription, invoice, and other Stripe events, including signature checks and retry-safe processing.
Why use it?
It helps prevent forged events, duplicate processing, slow responses, and failures when Stripe retries a notification.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 5repo 3mo ago A scan 65 tokens original MIT

Good fit Use it to add or repair handlers for checkout, subscription, invoice, and other Stripe events, including signature checks and retry-safe processing.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/appeeky/stripe-skills/webhook-implementation
View source ↗ appeeky/stripe-skills appeeky.com
Install

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.

Any agent
npx skills add appeeky/stripe-skills --skill webhook-implementation
Clone the repo
git clone --depth 1 https://github.com/appeeky/stripe-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for webhook-implementation

README.md
[![agentmods](https://agentmods.dev/badge/skills/appeeky/stripe-skills/webhook-implementation/github.svg)](https://agentmods.dev/skills/appeeky/stripe-skills/webhook-implementation)
Your own site
<a href="https://agentmods.dev/skills/appeeky/stripe-skills/webhook-implementation"><img src="https://agentmods.dev/badge/skills/appeeky/stripe-skills/webhook-implementation/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.

agentmods 80×15 button for webhook-implementation

Your own site · 80×15
<a href="https://agentmods.dev/skills/appeeky/stripe-skills/webhook-implementation"><img src="https://agentmods.dev/badge/skills/appeeky/stripe-skills/webhook-implementation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 65 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 345 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00065 $0.00345
Opus 5.5 $0.00026 $0.00138
Sonnet 5.5 $0.00013 $0.00069
Haiku 4.5 $0.00006 $0.00034

Measured 2mo ago against content hash 7c93652fe1b3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

webhook-implementation 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 2mo 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.

skills/webhook-implementation/SKILL.md · 43 lines

What it actually says

Webhook Implementation

Builds robust Stripe webhook handlers. Match the project's stack or ask users (Next.js route, Express, Supabase edge function).

Must-haves

  1. Raw body for signature verification (no JSON pre-parse)
  2. stripe.webhooks.constructEvent(body, sig, secret)
  3. Idempotency -- dedupe by event.id (store processed IDs)
  4. Return 200 fast; heavy work async
  5. Handle only subscribed events; ignore rest gracefully

Core events (subscription SaaS)

Event Handler action
checkout.session.completed Provision access, save customer/sub IDs
customer.subscription.updated Sync plan + status
customer.subscription.deleted Revoke access
invoice.payment_failed Trigger dunning email/banner
invoice.paid Confirm renewal

Pattern (pseudocode)

event = constructEvent(rawBody, sig, secret)
if alreadyProcessed(event.id): return 200
switch event.type: ...handle...
markProcessed(event.id)
return 200

Verify

Use Stripe CLI stripe listen / stripe trigger, or check webhook-reliability after deploy.

Changes

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.

  1. 2mo ago First seen · 43 lines · 65 tokens per session scan A 7c93652fe1b3

Subscribe to this mod's changes

webhook-implementation is a skill published in the GitHub repository appeeky/stripe-skills (5 stars, last pushed 3mo ago), licensed MIT. It adds 65 tokens to every session and 345 once invoked, about $0.0003 per session on Opus 5.5. 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.

Backend and APIsskillsstripestripe-skills
Related

webhook-implementation compared with skills from other repositories

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