You will need to have registered an account with USPS at http://www.uspsprioritymail.com/et_regcert.html to use this module

USPS expects you to use pounds as weight measure for your products.'); define('MODULE_SHIPPING_USPS_TEXT_OPT_PP', 'Parcel Post'); define('MODULE_SHIPPING_USPS_TEXT_OPT_PM', 'Priority Mail'); define('MODULE_SHIPPING_USPS_TEXT_OPT_EX', 'Express Mail'); define('MODULE_SHIPPING_USPS_TEXT_ERROR', 'Unable to find a USPS shipping quote suitable for your mailing address and the shipping methods we typically use.
If you prefer to use USPS as your shipping method, please contact us for assistance.'); define('MODULE_SHIPPING_USPS_TEXT_SERVER_ERROR', 'An error occurred in obtaining USPS shipping quotes.
If you prefer to use USPS as your shipping method, please contact the store owner.'); define('MODULE_SHIPPING_USPS_TEXT_DAY', 'day'); define('MODULE_SHIPPING_USPS_TEXT_DAYS', 'days'); define('MODULE_SHIPPING_USPS_TEXT_WEEKS', 'weeks'); ?>