USPS First-Class Package Service has been folded into a new service: USPS Ground Advantage.
So if you were using USPS First-Class Package Service in the past, you'll probably want to display rates for USPS Ground Advantage now instead.
This article provides guidance for using the app.
USPS First-Class Package Service has been folded into a new service: USPS Ground Advantage.
So if you were using USPS First-Class Package Service in the past, you'll probably want to display rates for USPS Ground Advantage now instead.