Postmaster is a modern, RESTful API for shipping packages on the web. Ship through multiple vendors (UPS, Fedex, and USPS). Track packages and get event callbacks on exceptions. Validate addresses and schedule pickups.
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The Postmaster Go Sample Code by Postmaster allows API communication to create a shipment and obtain rates. Functions allow to include postmaster address to send a package and receive a rate according to package's weight, distance, and destination.