After a second thought, you should not need authentication if your script is executed in an authenticated context. User and password from current session will be saved.
If you need to authenticate the AJAX with another user's credentials, you can use Basic Auth with AJAX as explained here: https://zinoui.com/blog/ajax-basic-authentication
That's a good way to "hide" credentials. I guess it's far better than generating a cookie and reusing it as you'll need to pass the credentials to generate a cookie anyway :)
Please note that Basic Auth is reversible and I can't imagine any "truely secure" way of authentication through ajax with no credentials displayed.
Hope this helps!
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