URI routing question

[eluser]freshmug[/eluser]
Yes, I don't have total control over the callback URL:
http://www.mysite.com/index.php/mycontro...98dd444334

I only control the callback part of it:
http://www.mysite.com/index.php/mycontroller

The external site I'm calling adds:
?auth_token=88797abc89798dd444334

And I can't control how they pass the auth_token back to me, so I can't make the callback look like:
http://www.mysite.com/index.php/mycontro...98dd444334


I'll try to figure out how to use htaccess to rewrite the URL. I'm not familiar with htaccess but will try my best.

I'll look into "enabling query strings" if that doesn't work.

Thanks for the responses. I'll let you know how it goes. Please let me know if you have any other suggestions/ideas.