WooCommerce

WooCommerce is the open-source commerce plugin for WordPress, giving brands a storefront and checkout inside a site they already control.

Because it runs on your own hosting, order and customer data live on your infrastructure — which makes server-side capture straightforward and removes any dependency on the shopper’s browser.

WooCommerce is a WordPress plugin, so the store runs on your own hosting and writes to your own database. Orders, customers and products are WordPress post types and custom tables; the REST API and a webhook system expose them to outside services. Because the checkout is rendered by your theme rather than a hosted page, its markup varies from site to site — which is why browser-side tracking on WooCommerce breaks more often than on hosted platforms. Server-side, the picture is more stable: the order object is the same shape on every install, whatever the front end looks like.

WooCommerce gives you a stable order object and an unstable front end. Upstack takes the stable half: events are captured server-side, so nothing depends on your theme, your caching layer or the plugin stack rendering correctly for a given shopper. Each order is then resolved against the device graph, so guest checkouts — most first purchases — stop arriving as strangers, and forwarded to every destination you run from one connection.