I've implemented all the changes in other posts. I do not have errors and nothing in the error.log. I've cleared the cache, updated the variable names, etc. My account information in both the test and production setting is working - no errors. No matter what combination of options I select in the extension I can never get the shipping quote to display.
I have run the C# sample code downloaded from FedEx developer site with my account info and it returned results. I do not know where to look for the SOAP message sent from OpenCart or the one received from FedEx to compare.
Please let me know if anyone else has had issues or what config you have in a working system 18.104.22.168. If you need more information or screenshots just let me know.