[OpenID] How to get started with OpenID

[Shade (pseudonymously)]

>Link to WargamingID API: http://url9.de/X04

Access forbidden. I take it this rejects standard web requests and 
only answers API calls?

>I would like to add OpenID login to my website. More precisely
>WargamingID. But I can't find anywhere some kind of tutorial to do so.

There are many tutorials for OpenID; look at guides for PHP, because 
that's what Joomla uses internally. You could probably implement your 
own extension for it, if you know PHP well enough.

>have asked web-masters who are using OpenID/WargamingID for login. I
>have asked in several forums. But I don't get an answer. It looks like
>OpenID is a big secret only accessible for some IT-professionals.

That's kind of like saying HTTP is a big secret; everyone uses it, 
but most people don't have to worry about the finer details of 
implementing it. In this case, what you're facing may be more of a 
competitive edge; the people in your space don't want to help you 
out, because the work they've done (or had done for them) represents 
value invested into making *their* site out-compete *your* site.

In the case of both HTTP and OpenID, however, the documentation is 
fully available, the specifications are public, multiple reference 
implementations exist, and you can even find tests online to tell you 
what's working and where it breaks. Access is not restricted to 
professionals; end-users can (and have) built their own OpenID stack 
for the one website they run. I recall a PHP single-user OpenID 
provider; siege.org, still there. You can borrow/adapt that code if 
you're willing to comply with the license on it.

-Shade