I signed up at:

http://www.uspsprioritymail.com/et_regcert.html

for a USPS Web Tools account. It then e-mailed me with a "Web Tools User ID"

The USPS Shipping Module asks for:

"Enter the USPS User ID
Enter the USPS USERID assigned to you."

and

"Enter the USPS Password
See USERID, above."

what are the proper values for these?