as you want the page to be accessible via a direct link, the easiest way is to use an awp page
Because you want the user to see the result of his click on the link, you want that page to have a UI
BUT, you CAN do it with a session page if you prefer:
In that case, you just call the regular MAIN url for your website, but you pass an extra parameter in the URL (confirm=GUID by example)
In your first projuect page, you check for that parameter, and use the content of the param (GUID in my example) to validate the account, then display whatever you want (on the main page or another one)