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This PHP SDK works with the API and allows you the ability to access UPS, FedEx and USPS Shipping API's. RocketShipIt uses your operating system’s version of the PHP curl extension to send HTTP requests and provides a way to complete these tasks with the least amount of code possible. RocketShipIt does this by handling all communication with the carrier’s API and returning the data in usable form. In order for RocketShipIt to work, it needs to access the carriers’ APIs to generate accurate rates, get tracking information, generate labels and more.