Thank you for the offer for a paid plug in. There should be no need for a paid plug in when a free connection is available, or should be.
I did visit the link you provided and that is where I got my username. So, that is correct in my system. However, when I test a checkout, I get the following message.
"Warning: No shipping options are available. Please contact us for assistance"
If you wanted to see it for yourself, the URL is
www.paraorange.com/storefront
I just need help understanding why it's not working when everything is set up correctly.
Debug is on. When tested, nothing shows up in the error log.