I added the full Response to my page and found that the API address was incorrect from what was provided by USPS, so I updated that.
USPS provides information on the API but is only for RateV4 while the tools provided here are RateV3.
The system now works, but the RateV4 reference materials provided by USPS do not match the webassist RateV3 programming.
This is above my coding knowledge, hence using webassist, and may need to be updated to reflect the USPS new API.