My cart has been operating flawlessly for a few months now, but yesterday a customer emailed me because they couldn't check out.

I put an order through my cart to see what was going on and when it gets to checkout Shipping Method, It says -

FedExGround

No Rates Returned, 0531: FedEx Ship Manager API has been retired. Please use an alternate FedEx solution or go to http://www.fede.com/us/developer/migration.html for more information

And then it says the same thing for FedEx Express.

Do I need to install a new FedEx Module? Can someone direct me to the proper one to install. Thanks once again for helping me. Things have been going so smoothly, and now this. Frustration here...