Yes i use Cloudflare but i already had a page rule where i said to cloudflare to bypass these pages:
www.lifeintravel.it/index.php?option=com_comprofiler&*
Now i also added this "cache bypass":
(http.request.uri.path contains "option=com_comprofiler&view=pluginclass&plugin=cbpaidsubscriptions")
but still it doesn't work (i tried even with incognito browser page)
I tried also to set cloudflare in development mode (no cache) and still coupons don't work