kyuL

Problem:
You are experiencing a 403 error on WooCommerce AJAX files when using the WPML plugin. This issue prevents AJAX functions from responding correctly on pages like the WooCommerce checkout and product category pages.
Solution:
We recommend changing the URL format in WPML to 'Different languages in directories' instead of 'Language name added as a parameter'. You can adjust this setting by navigating to WPML → Languages → Language URL format and then re-saving your permalinks. This adjustment has been tested and found effective in resolving the AJAX issue.

Please note that this solution might be outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket at WPML support forum for further assistance.