Title: MerchantStamp Catalog Audit for WooCommerce
Author: arnaud92
Published: June 15, 2026
Last modified: June 15, 2026
---
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# MerchantStamp Catalog Audit for WooCommerce
By [arnaud92](https://profiles.wordpress.org/arnaud92/)
[Download](https://downloads.wordpress.org/plugin/merchantstamp-catalog-audit.1.0.6.zip)
* [Details](https://wordpress.org/plugins/merchantstamp-catalog-audit/#description)
* [Reviews](https://wordpress.org/plugins/merchantstamp-catalog-audit/#reviews)
* [Installation](https://wordpress.org/plugins/merchantstamp-catalog-audit/#installation)
* [Development](https://wordpress.org/plugins/merchantstamp-catalog-audit/#developers)
[Support](https://wordpress.org/support/plugin/merchantstamp-catalog-audit/)
## Description
**MerchantStamp Catalog Audit is the AI-readiness layer for WooCommerce catalogs.**
It helps merchants audit catalog quality, enrich missing product schema, and publish
AI-ready feeds — without replacing their existing SEO or feed plugin.
Unlike traditional feed plugins focused on channel exports, this plugin focuses
on **catalog completeness and machine readability** for modern AI-driven discovery.
#### Fully functional, free, and offline-first
This plugin is **100% functional locally**. Every feature listed below runs on your
server with no external service required. There is no time limit, no product cap,
no locked feature behind a license key.
* Full ShopScore audit (no product limit)
* Field Coverage Analytics
* Top Issues panel (the fields with the most missing values, ranked)
* Prioritized Recommendations (actions ranked by estimated ShopScore gain)
* JSON-LD enrichment on top of Yoast, Rank Math, or native WooCommerce
* `products.jsonld` feed (schema.org Product catalog)
* `llms.txt` feed (LLM-friendly catalog summary)
* `acp.json` feed (Agent Commerce Protocol)
* `agent.json` feed (with SHA-256 content-integrity proof)
* Scan history archive (60 most recent scans)
* Score Trend sparkline
* Compare any two scans (delta score, delta critical missing, per-field coverage
diff)
* Degradation alerts (banner when ShopScore drops or critical-missing rises)
* Automatic feed rebuild on product create / update / delete / stock change
* WooCommerce admin dashboard
* Full HPOS compatibility
#### Optional external service
The plugin can **optionally** connect to the MerchantStamp service for capabilities
that genuinely require a centralized backend. The plugin works entirely without
it.
What the service adds (Guideline 6 — Serviceware):
* **Centralized multi-site dashboard** — manage catalog quality across multiple
WooCommerce stores from one place
* **Cross-site verification key** — published at `merchantstamp.com/.well-known/
keys/`, referenced inside `agent.json` so AI agents can verify the integrity
of your published feed against a public key you control
* **Storefront discovery loader** — a small JavaScript snippet (versioned, SRI-
protected, opt-in) injected in the footer that helps AI agents find this site’s
feeds at scale
* **Advanced alerting** — Slack and email delivery of degradation alerts, beyond
the in-admin banner that this plugin shows for free
* **Push notifications** to your MerchantStamp dashboard after each rebuild
Pricing for the MerchantStamp service is at [merchantstamp.com](https://merchantstamp.com).
#### Built to work alongside your stack
* Yoast SEO / Yoast WooCommerce SEO
* Rank Math / Rank Math PRO
* AIOSEO
* Google for WooCommerce
* Product Feed PRO for WooCommerce
* Any WooCommerce-compatible theme
If another plugin already outputs valid schema, this plugin does **not overwrite
it**. It fills missing fields only.
#### Read-only by design
This plugin does not rewrite your WooCommerce product catalog. It reads your product
data, computes scores, enriches structured output at render time, and generates
feed files from existing catalog data.
#### External services
This plugin connects to MerchantStamp services **only when the user enters an API
key**. Without an API key, no external connection is ever made.
When a user enters a MerchantStamp API key, the plugin connects to:
**1. MerchantStamp Activation & Push API**
* Endpoint: `https://merchantstamp.com/api/webhooks/plugin`
* Purpose: Validate the API key on activation, and report feed-build status after
each rebuild so the merchant’s MerchantStamp dashboard stays in sync.
* Data sent: site URL, plugin version, WordPress version, WooCommerce version,
the merchant’s chosen slug, public feed URLs, total product count, average ShopScore,
build duration in milliseconds, and a UTC timestamp.
* No personal data, customer data, or order data is ever sent.
* Terms of service: https://merchantstamp.com/en/legal
* Privacy policy: https://merchantstamp.com/en/privacy
**2. Optional Storefront Loader Script**
* URL: `https://merchantstamp.com/js/silver-loader.v1.0.0.js`
* Purpose: A small JavaScript file injected in the site footer (only when an API
key is entered AND the filter `msca_inject_loader` is true) that helps AI discovery
systems find this site’s published feeds.
* Source code: https://github.com/arnaud-92/silver-loader
* Subresource Integrity: loaded with an SRI hash so the browser refuses to execute
any modified copy.
* Opt-out: site owners can disable the loader injection at any time by adding the
following filter:
* add_filter( ‘msca_inject_loader’, ‘__return_false’ );
#### Privacy
* Without an API key entered, this plugin sends no data to any external service.
* With an API key, the plugin sends only operational metadata listed in the **External
services** section above.
* No customer data, order data, email addresses, IP addresses, or other personal
information is collected, stored, or transmitted by this plugin.
* All generated feed files contain only public product information already published
on the merchant’s WooCommerce store.
* Plugin settings are stored in the standard WordPress options table; no custom
database tables are created.
* Scan history and cache are stored under `wp-content/uploads/merchantstamp-catalog-
audit/private/` (created with index.php silencers and `.htaccess` denial rules).
## Screenshots
[⌊ShopScore dashboard — overall catalog score, top missing fields, the four public
AI-ready feeds (products.jsonld, llms.txt, acp.json, agent.json), and recommendations
ranked by score gain.⌉⌊ShopScore dashboard — overall catalog score, top missing
fields, the four public AI-ready feeds (products.jsonld, llms.txt, acp.json, agent.
json), and recommendations ranked by score gain.⌉[
ShopScore dashboard — overall catalog score, top missing fields, the four public
AI-ready feeds (products.jsonld, llms.txt, acp.json, agent.json), and recommendations
ranked by score gain.
[⌊Field Coverage Analytics — per-field completeness across your published products,
color-coded from complete to critical.⌉⌊Field Coverage Analytics — per-field completeness
across your published products, color-coded from complete to critical.⌉[
Field Coverage Analytics — per-field completeness across your published products,
color-coded from complete to critical.
[⌊Score Trend & Scan History — ShopScore over time with the last 60 scans archived;
click any scan to compare it against the latest.⌉⌊Score Trend & Scan History — ShopScore
over time with the last 60 scans archived; click any scan to compare it against
the latest.⌉[
Score Trend & Scan History — ShopScore over time with the last 60 scans archived;
click any scan to compare it against the latest.
[⌊Compare two scans — side-by-side delta of ShopScore, critical-missing count, and
per-field coverage between any two scans.⌉⌊Compare two scans — side-by-side delta
of ShopScore, critical-missing count, and per-field coverage between any two scans
.⌉[
Compare two scans — side-by-side delta of ShopScore, critical-missing count, and
per-field coverage between any two scans.
## Installation
1. Upload the `merchantstamp-catalog-audit` folder to `/wp-content/plugins/`, or install
via **Plugins Add New** and search for “MerchantStamp Catalog Audit”.
2. Activate the plugin in the WordPress admin.
3. Open **MerchantStamp Catalog Audit** in the admin sidebar.
4. Run your first catalog scan.
5. Review your ShopScore, Top Issues, and Recommendations.
6. Generate or rebuild feeds.
7. _(Optional)_ If you want the centralized multi-site dashboard and the storefront
loader, enter a MerchantStamp API key from [merchantstamp.com](https://merchantstamp.com).
**Requirements:**
* WordPress 6.0 or higher
* WooCommerce 7.0 or higher
* PHP 7.4 or higher
* Pretty permalinks enabled (for public feed URLs)
## FAQ
### Do I need a MerchantStamp account to use this plugin?
No. Every feature runs locally on your WordPress server with no external service
required. The plugin is fully usable without ever creating an account.
### What does the MerchantStamp service add that this plugin can’t do alone?
The plugin can audit, enrich, and publish AI-ready feeds entirely on its own. The
MerchantStamp service adds capabilities that genuinely require a centralized backend:
multi-site dashboard across many stores, cross-site verification key publication,
advanced Slack/email alerting, and a CDN-hosted storefront loader. None of these
can be done by a single WordPress install on its own.
### Does this plugin modify my WooCommerce product data?
No. It is read-only with respect to WooCommerce product records.
### Does it replace Yoast SEO or Rank Math?
No. It works alongside them. If your SEO plugin already outputs structured product
data, this plugin fills common gaps instead of replacing the schema layer.
### Will feeds rebuild automatically?
Yes. The plugin detects product create/update/delete and stock changes, and schedules
feed rebuilds automatically using WP-Cron with a 60-second debounce.
### How many products can it scan?
Unlimited. The plugin paginates through your entire catalog regardless of size.
### How do I disable the optional external loader script?
The loader is only injected when (1) a MerchantStamp API key is entered AND (2)
the filter `msca_inject_loader` returns true. To disable explicitly:
```
add_filter( 'msca_inject_loader', '__return_false' );
```
### Can I uninstall safely?
Yes. Uninstalling removes plugin settings, the private cache directory, and the
scan history. Your WooCommerce product data is not changed. Public feed files in`
wp-content/uploads/merchantstamp-catalog-audit/feeds/` are intentionally preserved(
in case AI agents still reference them) — you can delete them manually if desired.
### Is it compatible with HPOS (High-Performance Order Storage)?
Yes. The plugin declares HPOS compatibility and does not interact with the orders
table.
## Reviews
There are no reviews for this plugin.
## Contributors & Developers
“MerchantStamp Catalog Audit for WooCommerce” is open source software. The following
people have contributed to this plugin.
Contributors
* [ arnaud92 ](https://profiles.wordpress.org/arnaud92/)
[Translate “MerchantStamp Catalog Audit for WooCommerce” into your language.](https://translate.wordpress.org/projects/wp-plugins/merchantstamp-catalog-audit)
### Interested in development?
[Browse the code](https://plugins.trac.wordpress.org/browser/merchantstamp-catalog-audit/),
check out the [SVN repository](https://plugins.svn.wordpress.org/merchantstamp-catalog-audit/),
or subscribe to the [development log](https://plugins.trac.wordpress.org/log/merchantstamp-catalog-audit/)
by [RSS](https://plugins.trac.wordpress.org/log/merchantstamp-catalog-audit/?limit=100&mode=stop_on_copy&format=rss).
## Changelog
#### 1.0.6
* Trimmed the Short Description to comply with the 150-character limit (was 159
chars).
#### 1.0.5
* Fixed Plugin URI to point to the live English product page: https://merchantstamp.
com/en/platforms/woocommerce (previous URL was a 404).
#### 1.0.4
* Updated Plugin URI to a dedicated product page: https://merchantstamp.com/en/
platforms/woocommerce
* Updated legal links in readme: Terms /en/legal, Privacy /en/privacy
* Softened user-facing wording: “Pro activated!” “MerchantStamp service connected”
#### 1.0.3
* Fixed a file integrity issue: removed 147 trailing NUL bytes from class-feeds.
php that caused a PHP parse error.
* All PHP files now pass `php -l` cleanly (verified with PHP 8.2).
* Aligned all internal plan references on “free” (previously some branches in the
API key sync reset to “bronze”, creating an inconsistency with the rest of the
codebase).
* Cleaned legacy comments that referred to “Silver / Gold” or “F6 / F7” for features
that are now fully local and free.
#### 1.0.2
* Cosmetic cleanup of stale code comments referring to “(Pro)” or “Bronze+” labels
for features that are now fully local and free.
* No functional change vs 1.0.1 — all local features remain unconditionally enabled.
#### 1.0.1
* All “Pro” features unlocked in the plugin: ACP feed, agent.json, scan history,
compare, degradation alerts, score trend.
* Removed the “Free limit reached” badge and the upgrade banner from the admin (
Guideline 11 compliance).
* The plugin is now 100% functional locally,
## Meta
* Version **1.0.6**
* Last updated **3 weeks ago**
* Active installations **Fewer than 10**
* WordPress version ** 6.0 or higher **
* Tested up to **6.9.4**
* PHP version ** 7.4 or higher **
* Tags
* [AI](https://wordpress.org/plugins/tags/ai/)[JSON-LD](https://wordpress.org/plugins/tags/json-ld/)
[product feed](https://wordpress.org/plugins/tags/product-feed/)[structured data](https://wordpress.org/plugins/tags/structured-data/)
[woocommerce](https://wordpress.org/plugins/tags/woocommerce/)
* [Advanced View](https://wordpress.org/plugins/merchantstamp-catalog-audit/advanced/)
## Ratings
No reviews have been submitted yet.
[Your review](https://wordpress.org/support/plugin/merchantstamp-catalog-audit/reviews/#new-post)
[See all reviews](https://wordpress.org/support/plugin/merchantstamp-catalog-audit/reviews/)
## Contributors
* [ arnaud92 ](https://profiles.wordpress.org/arnaud92/)
## Support
Got something to say? Need help?
[View support forum](https://wordpress.org/support/plugin/merchantstamp-catalog-audit/)