Presently, the USPS module does not pull commercial rates for USPS First Class Parcels as it does for the other mail classes. Instead it is using the higher retail rate paid when going to the USPS counter. The other issue is that the Retail Rate does not support First Class Packages greater than 13oz. The Commercial Rate supports such packages up to 15.9oz. First Class rates are not presented to customers when an order's weight falls within this range. Please modify the module to use the Commercial Rate to resolve these issues.
Thanks,
Paul
Thanks,
Paul