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USPS Express Mail Label API

This API will let customers create Priority Mail Express Labels that are printed without postage and must be purchased and applied separately. It allows you to integrate USPS Web Tools® into a web site or shipping application. USPS Web Tools® API library enables external e-commerce shopping cart and shipping software to access USPS® data. From shipping rates to tracking information to scheduling a package pickup, Web Tools makes shipping with the U.S. Postal Service® easily accessible.