I just got a call from FedEx informing me there are changes coming to their API - they are replacing it with a web services method. She didn't elaborate when this would happen or who it would affect, but I'm guessing the connection from Zen-Cart to FedEx may use this API to obtain rates, and that will cease when they drop API support for web services.
I checked and didn't find a thread on this subject, so wanted to bring it up now. I think the web services piece is in production now. For more information, the starting point within fedex is http://www.fedex.com/developer.
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