Eric, I will attempt to make contact with USPS to obtain access to their production URL.
However, I have another question that is relevant to this topic...I am looking to offer training workshops, in addition to selling products on my website. I currently have one eCart profile created (eCart1). I will not be offering shipping for my training workshops. Do I need to create another eCart profile for my workshops so not to assess shipping charges or prompt for a shipping quote?
If so, do I have to go through the checkout wizard all over again?