I've searched around for solutions to this but haven't found anything so far so thought i'd ask and see if anyone knows.
Essentially, we're trying to intergrate an ASP.net web app with SharePoint Online. Links from the app are to open libraries where users can access documents. Management doesn't want to purchase additional licenses for these users or allow them to use their live IDs to authenticate into our site.
Does anyone know of any methods of opening a new browser window, which is pre authenticated as a user we've created into a particular site? I am guessing using C# CSOM to authenticate into SharePoint Online and then open a site in the browser as said user.
The idea is that this user account would be able to read the documents required and that's it.
Any help appreciated, bit stuck on this one at the moment. Cheers!