Hello
I called WIX service which told me that they do support the access to third party web services ( https://support.wix.com/en/article/guidelines-and-limitations-of-the-html-code-and-embed-a-site-elements ).
I tried the 2 ways to do it (through the " Html " widget, and through " Tracking & Analytics" of the editor), but it is still not working.
I will copy-paste the code below (to get referrals, which is VERY important for my product)…Thanks !