Title: Mountaineering Labs Multi-Store Stock Sync for WooCommerce Author: mountaineeringlabs Published: July 23, 2026 Last modified: July 23, 2026 --- Search plugins ![](https://ps.w.org/mountaineering-labs-stock-sync/assets/banner-772x250.png?rev =3620098) ![](https://ps.w.org/mountaineering-labs-stock-sync/assets/icon-256x256.png?rev= 3620094) # Mountaineering Labs Multi-Store Stock Sync for WooCommerce By [mountaineeringlabs](https://profiles.wordpress.org/mountaineeringlabs/) [Download](https://downloads.wordpress.org/plugin/mountaineering-labs-stock-sync.zip) * [Details](https://wordpress.org/plugins/mountaineering-labs-stock-sync/#description) * [Reviews](https://wordpress.org/plugins/mountaineering-labs-stock-sync/#reviews) * [Installation](https://wordpress.org/plugins/mountaineering-labs-stock-sync/#installation) * [Development](https://wordpress.org/plugins/mountaineering-labs-stock-sync/#developers) [Support](https://wordpress.org/support/plugin/mountaineering-labs-stock-sync/) ## Description Run several WooCommerce stores that sell the same products — for example a domestic and an international site — and keep stock quantities in sync automatically. **How it works** * One site is configured as the **hub**, the authoritative source of stock levels. The other sites are **spokes**. * When stock changes anywhere (a sale, a refund/restock, or a manual edit in wp- admin), the change is picked up via WooCommerce’s stock hooks and sent to the hub. * The hub updates its own stock **atomically** (safe under concurrent sales on different sites) and broadcasts the resulting authoritative value to all spokes. * Products and variations are matched across sites by **SKU**. Works with both simple and variable products. **Reliable by design** * Outbound messages are written to a local queue (a fast database insert) — customer- facing requests never wait on network calls to other sites. * A background worker delivers queued messages within seconds and retries with backoff if a peer site is temporarily unreachable. Temporary outages cause delay, not data loss. * Every message carries a unique id; receivers ignore duplicates, so retries can never double-apply a stock change. **Secure** * Sites communicate over a dedicated REST endpoint authenticated with an HMAC-SHA256 signature over a shared secret — no WooCommerce API keys needed. * Stale requests are rejected and duplicate message ids are ignored (replay protection). **Languages** English admin UI, fully internationalized. Translations are managed through translate. wordpress.org and delivered automatically. ## Installation 1. Install and activate the plugin on **every** site that should participate. 2. On the hub site: go to _WooCommerce Stock Sync_, set role **Hub**, choose a Site ID, generate a shared secret, and list the spoke URLs (one per line). 3. On each spoke site: set role **Spoke**, choose a Site ID, paste the **same** shared secret, and set the Hub URL. 4. On the hub: click **Run full resync** to push current stock levels to all spokes. 5. Test: change a stock quantity on one site and confirm it updates on the others. The **Recent events** log on each site’s settings page shows exactly what was sent and received. Corresponding products/variations must share the same SKU on every site, and have“ Manage stock” enabled. For variable products the SKU on **each variation** is what counts. ## FAQ ### Do all products have to exist on every site? No. Products that only exist on some sites are simply not synced — unknown SKUs are ignored by the receiver. However, every product you want synced must exist on the hub, since all sync flows through it. ### Does a spoke work if the hub is down? Yes. Orders complete normally — stock reports are queued locally and delivered automatically once the hub is reachable again. ### Why is sync slow on my site? Delivery runs on WP-Cron, which is triggered by site visits. On low-traffic sites, configure a real server cron job to hit wp-cron.php on each site. ### My sites are on the same server and I see timeouts in the log Ask your host about loopback requests and the number of concurrent PHP workers. The queue retries automatically, so changes still arrive — just with delay. ### Can I map different SKUs to each other across sites? Identical SKUs are strongly recommended, but the `wcss_resolve_sku` filter lets developers map incoming SKUs to local product IDs in code. ## Reviews There are no reviews for this plugin. ## Contributors & Developers “Mountaineering Labs Multi-Store Stock Sync for WooCommerce” is open source software. The following people have contributed to this plugin. Contributors * [ mountaineeringlabs ](https://profiles.wordpress.org/mountaineeringlabs/) [Translate “Mountaineering Labs Multi-Store Stock Sync for WooCommerce” into your language.](https://translate.wordpress.org/projects/wp-plugins/mountaineering-labs-stock-sync) ### Interested in development? [Browse the code](https://plugins.trac.wordpress.org/browser/mountaineering-labs-stock-sync/), check out the [SVN repository](https://plugins.svn.wordpress.org/mountaineering-labs-stock-sync/), or subscribe to the [development log](https://plugins.trac.wordpress.org/log/mountaineering-labs-stock-sync/) by [RSS](https://plugins.trac.wordpress.org/log/mountaineering-labs-stock-sync/?limit=100&mode=stop_on_copy&format=rss). ## Changelog #### 1.4.1 * Display name now includes “Multi-Store” to better describe what the plugin does. #### 1.4.0 * Renamed to Mountaineering Labs Stock Sync for WooCommerce for a distinctive name. * Admin settings script is now enqueued via wp_enqueue_script instead of inline output. * Removed bundled translation files; translations are handled by translate.wordpress. org. #### 1.3.0 * Renamed to Mountaineering Labs Stock Sync for WooCommerce (trademark compliance). * Hardened SQL statements and cleaned up coding-standard warnings. #### 1.2.0 * Added German, French, Spanish, Danish and Swedish translations. #### 1.1.0 * English admin UI with Norwegian (bokmål and nynorsk) translations. * Replay/duplicate protection: every message carries a unique id; retries can no longer double-apply a change. * uninstall.php: cleans up all plugin data on deletion. * Schema migrations now run on in-place upgrades as well as activation. #### 1.0.0 * Initial release: hub/spoke stock sync with signed messages, durable outbound queue with retry, and full resync. ## Meta * Version **1.4.1** * Last updated **1 day ago** * Active installations **Fewer than 10** * WordPress version ** 6.5 or higher ** * Tested up to **7.0.2** * PHP version ** 7.4 or higher ** * Tags * [inventory](https://wordpress.org/plugins/tags/inventory/)[multistore](https://wordpress.org/plugins/tags/multistore/) [stock](https://wordpress.org/plugins/tags/stock/)[synchronization](https://wordpress.org/plugins/tags/synchronization/) [woocommerce](https://wordpress.org/plugins/tags/woocommerce/) * [Advanced View](https://wordpress.org/plugins/mountaineering-labs-stock-sync/advanced/) ## Ratings No reviews have been submitted yet. [Your review](https://wordpress.org/support/plugin/mountaineering-labs-stock-sync/reviews/#new-post) [See all reviews](https://wordpress.org/support/plugin/mountaineering-labs-stock-sync/reviews/) ## Contributors * [ mountaineeringlabs ](https://profiles.wordpress.org/mountaineeringlabs/) ## Support Got something to say? Need help? [View support forum](https://wordpress.org/support/plugin/mountaineering-labs-stock-sync/)