I have a nodejs javascript test program as follows:

const USPS = require('usps-webtools');

const usps = new USPS({
    server: 'https://production.shippingapis.com/ShippingAPI.dll',
    userId: 'user:passwd',
    ttl: 10000 //TTL in milliseconds for request
    });
usps.verify({
    street1: '1234 Some Lane',
    city: 'AnyTown',
    state: 'MI',
    zip: '12345'
    }, function(err, address){
      console.log(err)
      console.log(address);
      });

It always returns with:

Authorization failure. Perhaps username and/or password is incorrect.

USPSCOM::DoAuth

But I can go to usps.gov and login with the same account name and password.
How does it want me to pass the username and password to it?