E-Commerce and Authorize.net

Does anyone have an Ecommerce site that uses Authorize.net?  I do and my 
transactions are bombing because they did an upgrade yesterday and now none 
of my credit card transactions are working properly.  I think I just need to 
link to a new URL, but I don't know what it is.  When I try to email them, 
the email address is invalid and when I try to go to their manual to learn 
how to do it, it links me to a page that says "coming soon"!!!!  I can't 
believe they would do this without providing correct and complete links!

Any help anyone can give me would be great to find out the new URL to link to.

thanks,
Andy

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