Thank you.
1. I can see you have updated FPX add-on to latest version, this is good. It should fix the issue with “Error occurred: URL: Code 0” on your site. Thank you for reporting it.
2. I can see you’re using some caching plugin. Generally, it’s not a good idea to cache payment popup URLs. If your caching plugin allows you to add exclusions, please add ?asp_action=* to the exclusions list. It should not cache, minify and combine payment popup page\scripts, otherwise your customers may experience issues with payment popup.
3. Can you let me know which caching plugin you are using? We will try to add compatibility with it if possible, by telling it to not cache payment popup URLs internally.
4. Last, but not least – every time you make changes to plugin settings or products, or updating plugins, always clear all caches of your caching plugin. Expired cache can cause various issues at random, and not only with our plugin. To check if everything is working properly, access your site via Incognito (Private) browser mode as non-logged-in user.