The USPS eVS GXG Get Label API allow developers to generate Global Express Guaranteed (GXG) labels appropriate for a given shipment's weight and dimensions. GXG is USPS's fastest international shipping service. It provides date-certain delivery in 1-3 business days to more than 190 countries with a money-back guarantee for all destinations.
This API is part of the USPS Web Tools API library which provides access to USPS data free of charge.
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