↑ Back to topIf the issue persists with only WooCommerce and One Page Checkout activated, it’s suggested that you contact your hosting provider and ask them if there is any reason why the hosting would block this AJAX call. Examples of these reasons might have to with security rules, firewalls, and permissions.Caching on the page can also interfere with the AJAX calls. Ask your hosting provider if AJAX requests are cached and if there is a way to exclude specific pages from caching. If so, exclude the page that displays One Page Checkout.If the issue persists and the cause has not been found, open a support ticket. Please include any steps you have taken for troubleshooting and the information gathered.