Post #26 has the current USPS January 2, 2011 C version for usps.php ...
http://www.zen-cart.com/forum/showthread.php?t=171314
1 Save current settings
2 Load the new version to the server
3 Remove the USPS shipping module
4 Install the USPS shipping module
5 Re-configure the settings
NOTE: Some sites, based on Tare Settings, may need to change the rounding from 3 to 2 ...
Code:
$shipping_ounces = zen_round($shipping_ounces, 3);
NOTE: Older versions of Zen Cart may need to change (You should really be upgrading if you need to do this):
Code:
class usps extends base {
to read:
Closing this thread see:
class usps extends base {