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USPS has an entire suite of digital products available through their RIBBS website. One of the services they have available alongside these purchases is a digital delivery service named Electronic Product Fulfillment (EPF). This service allows you to download your products via either their EPF website or a REST API.

USPS EPF Supported: v1.04.2 - 2014-04-30

This project contains tools for interacting with EPF services, as well as parsers for the data you can purchase.

PHP EPF Class Reference