About this plugin
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/<slug>, 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
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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.
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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).