First off, I agree with Olaf 
In the past, I have used VBS to access the HTML DOM (Document Object Model) to get web page information, but that was ages ago. It also used IE which for the most part, is dead. I also don’t have time to test something, but you might get some ideas here:
And, should you still have IE available …
https://social.technet.microsoft.com/Forums/scriptcenter/en-US/38a40c23-99a7-41e5-b5de-e527da600cc0/html-dom-with-powershell?forum=winserverpowershell
In my case, I wrote a cheesy script go get FedEX shipping quotes. You will need to view the page source to get the Element ID’s, or classes or whatever you want returned as they should have names defined.
Another word of caution. If the page is internet facing, and changes, your script typically breaks.