Foxycart help
Jamroom Help
In my FoxyCart account, I've not set anything up in the template section except for the checkout template which should have the URL yourdomain.com/foxycart/remote_templates/checkout. Everything else in the Templates section is set to default values.
Is your site setup for SSL?
If not, don't use https in your URL.
Also, if you have a link to your site we can check out, it might help narrow down the issue.
