Hmm, I could swear it just did it when you checked the debug box at admin/store/settings/quotes/edit, but trying it out it doesn't seem to show up. I don't know, it's late. Anyway, stick the following line in uc_usps.module in the function uc_usps_quote(), just after the first call to uc_usps_rate_request():
$services['data']['debug'] .= htmlentities($request) ."<br />\n";That should show your request.
Joined: 11/05/2007