Just to close out my comments here, I did finally upgrade to a PayPal Business Account
and the API & Security Header Errors are now gone.
Thanks for the help here, you folks are awesome!
Aaron
Mine is not a PayPal business account but I am getting this same error. I'v never had anything in the API fields.
I have tried resetting everything and nothing seems to work. Any help would be greatly appreciated!
Cheers,
Aaron