Please excuse the noob-ness of my questions!
I have a web application (ASP Classic for various reasons), and one of our clients would like to authenticate to it using their existing Azure AD SSO solution.
Do I need to purchase an API or something to provide this, or does Microsoft provide APIs for use in cases like this?
If so, is there an API that supports ASP Classic? I'm pretty sure I can integrate some .Net with the ASP Classic if required....
Any help/info/suggestions very welcome!