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 hookdeck/webhook-skills --skill shopify-webhooksgit clone --depth 1 https://github.com/hookdeck/webhook-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/hookdeck/webhook-skills/shopify-webhooks)<a href="https://agentmods.dev/skills/hookdeck/webhook-skills/shopify-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/shopify-webhooks/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/hookdeck/webhook-skills/shopify-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/shopify-webhooks.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 | $0.00039 | $0.01443 |
| Opus 5.5 | $0.00016 | $0.00577 |
| Sonnet 5.5 | $0.00008 | $0.00289 |
| Haiku 4.5 | $0.00004 | $0.00144 |
Grade A, and why
shopify-webhooks 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 1mo 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.
This is a copy
89% identical to adyen-webhooks — 165 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Shopify Webhooks
When to Use This Skill
- Setting up Shopify webhook handlers
- Debugging signature verification failures
- Understanding Shopify event types and payloads
- Handling order, product, or customer events
Verification (core)
Shopify signs the raw body with HMAC-SHA256 keyed on the app's API secret and sends the digest in X-Shopify-Hmac-SHA256 as base64 (not hex). Pass the raw body, decode base64, and compare timing-safe. The topic is in X-Shopify-Topic; the shop domain in X-Shopify-Shop-Domain.
Node:
const crypto = require('crypto');
function verify(rawBody, hmacHeader, secret) {
if (!hmacHeader) return false;
const expected = crypto.createHmac('sha256', secret).update(rawBody).digest('base64');
try {
return crypto.timingSafeEqual(Buffer.from(hmacHeader), Buffer.from(expected));
} catch {
return false;
}
}
Python:
import hmac, hashlib, base64
def verify(raw_body: bytes, hmac_header: str, secret: str) -> bool:
if not hmac_header:
return False
expected = base64.b64encode(
hmac.new(secret.encode(), raw_body, hashlib.sha256).digest()
).decode()
return hmac.compare_digest(hmac_header, expected)
Important: Shopify requires the endpoint to respond with 200 within 5 seconds. Process work asynchronously if the handler is slow.
For complete handlers with route wiring, event dispatch, and tests, see:
Common Event Types (Topics)
| Topic | Description |
|---|---|
orders/create |
New order placed |
orders/updated |
Order modified |
orders/paid |
Order payment received |
orders/fulfilled |
Order shipped |
products/create |
New product added |
products/update |
Product modified |
customers/create |
New customer registered |
app/uninstalled |
App removed from store |
For full topic reference, see Shopify Webhook Topics
Note: While the REST Admin API is becoming legacy for apps created after April 1, 2025, existing apps can continue using the REST API. New apps should consider using the GraphQL Admin API for webhook management.
What ships with it
19 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.
- examples/express/.env.example 108 B
- examples/express/package.json 371 B
- examples/express/README.md 836 B
- examples/express/src/index.js 3.6 KB runs code
- examples/express/test/webhook.test.js 3.8 KB runs code
- examples/fastapi/.env.example 108 B
- examples/fastapi/main.py 2.9 KB runs code
- examples/fastapi/README.md 871 B
- examples/fastapi/requirements.txt 82 B
- examples/fastapi/test_webhook.py 4.4 KB runs code
- examples/nextjs/.env.example 108 B
- examples/nextjs/app/webhooks/shopify/route.ts 2.8 KB runs code
- examples/nextjs/package.json 480 B
- examples/nextjs/README.md 710 B
- examples/nextjs/test/webhook.test.ts 3.1 KB runs code
- examples/nextjs/vitest.config.ts 140 B runs code
- references/overview.md 2.8 KB
- references/setup.md 3.0 KB
- references/verification.md 3.9 KB
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.
- 1mo ago First seen · 130 lines · 39 tokens per session scan A 6de108625bff
shopify-webhooks is a skill published in the GitHub repository hookdeck/webhook-skills (92 stars, last pushed today), licensed MIT. It adds 39 tokens to every session and 1,443 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 89% identical to adyen-webhooks, differing in 165 lines, and is treated as a copy.
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