@russian-dima Ha! Yes, I’ve been following your post as well to see if I can find anything wrong with mine too. The code I think is the culprit.
Things I’ve confirmed:
http-functions.js in Backend - check!
collection set to anyone for permissions - check!
confirmed the URL is https://client.wixsite.com/my-site/_functions/updateCode - check!
I have no idea why it’d be giving the server error when sending the payload unless there’s an error with the code maybe…