Full Answer

Plugin conflict diagnosis follows a process of elimination. Start by checking the browser console on your checkout and order confirmation pages for JavaScript errors — a red error message naming a plugin file is the fastest path to the answer.

If no console errors appear, switch to a default WordPress theme (Storefront or Twenty Twenty-Four) and test tracking. If it works, your theme is the conflict. If it still fails, go to Plugins and deactivate everything except WooCommerce and your tracking plugin. Place a test order. If tracking works, reactivate plugins in groups of three, testing each time, until tracking breaks again — that group contains the conflict. Common culprits: security plugins (Wordfence, iThemes), performance optimisers (WP Rocket, NitroPack), other analytics plugins, and live chat or heatmap scripts that inject JavaScript into checkout pages.