The spot where I marked it as XXXXXXX will be the two variables that you need.
Cookies
So, for the session_ID and csrftoken. For the session_ID, there's only one, don't confuse it with "sessionid". On my end I get multiple IDs for the csrftoken, just be sure you get the long csrftoken, it will be basically the same length of the session_ID.
Just wanted to give a bit of helpful advice to people I use FireFox, so it likely won't be different for Chrome.
Variables
base_url = "https://platform.virdocs.com/rscontent/epub/XXXXXXX/XXXXXXX/OEBPS/images/page-{}.jpg"
To find the base URL in inspect element, search for
../images/page-1.jpg
This will show up as a link, so right-click it click on "Open Link In New Tab" then look at the URL. It should look something like the URL below.
https://platform.virdocs.com/private/manifest_item/XXXXXXX/XXXXXXX/YYYYYYYYYYYYYYYYY.jpg?AWSAccessKeyId=YYYYYYYYYYYYYY&Signature=YYYYYYYY&Expires=YYYYYYYYYY
The spot where I marked it as XXXXXXX will be the two variables that you need.
Cookies So, for the session_ID and csrftoken. For the session_ID, there's only one, don't confuse it with "sessionid". On my end I get multiple IDs for the csrftoken, just be sure you get the long csrftoken, it will be basically the same length of the session_ID.
Hope that helps someone else out.