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.
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