A 403 error means that the server is refusing to fulfill the request. In this case, the request is for “wc-ajax=update_order_review” on a WordPress website.

This error is typically caused by one of the following issues:

Permission issues:

Make sure that the server has the proper permissions to access the requested resource.

Security plugins:

Some security plugins may block requests that contain certain parameters. Try disabling these plugins temporarily to see if they are causing the problem.

Conflicting plugins:

Conflicting plugins can cause unexpected errors. Try disabling plugins one by one to see if the problem is resolved.

PHP Configuration:

Your server’s PHP settings may need to be adjusted to allow for larger requests.

Incorrect .htaccess file:

The .htaccess file can sometimes cause 403 errors if it contains incorrect information.

A 403 error in WordPress when using the “GET wc-ajax=update_order_review” request typically indicates a permission issue. This error message indicates that the server is refusing to fulfill the request because the client does not have the necessary permissions.

Here are a few things you can try to resolve this issue:

  1. Clear your browser’s cache and cookies. Sometimes, a cached version of the page can cause 403 errors.
  2. Deactivate and reactivate all your plugins. A plugin may be causing a conflict with the WooCommerce checkout process.
  3. Switch to a default WordPress theme like Twenty Twenty-One. A theme may be causing a conflict with the WooCommerce checkout process.
  4. Check your .htaccess file. Make sure that mod_security is not blocking the request.
  5. Check the file permissions on the server. The server may be denying access to the necessary files or folders.
  6. Check your server’s security settings. Some security settings may be blocking the request.
  7. Check with your hosting provider. They may have added some security rules that are blocking the request.
  8. Check if there are any javascript errors on the page, it could be cause by a plugin or theme.

If none of these steps resolve the issue, it may be necessary to seek the help of a developer to further investigate the cause of the error.

It’s also worth noting that you can use the Debugging tools like Query Monitor, Debug Bar, and the WP_DEBUG constant to help you find the root cause of the problem.

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