Download Calls Audio Files via Http Admin WebSite or AMI

Hi, how can I download calls audio files with http admin, or AMI.
I don’t have direct access to the machine, it is provided by a 3rd party company over WAN.
I have only the http web admin, and AMI.

I am trying to simulate in C# what the http admin CDR page is doing to download a file:
*. I already have the key for the relevant call in this form - ‘1726056162.2149189’

Login - https://ipaddress/admin/ajax.php?module=userman&command=checkPasswordReminder

Download wav file - https://ipaddress/admin/config.php?display=cdr&action=download_audio&cdr_file=1726056162.2149189

It still doesn’t work, but maybe there is a better way…?