FedEx Time In Transit PHP class

I need a small PHP wrapper written to make use of the FedEx Rate Available? Services API. The main class has already been written. The attached file (fedexdc[1].[login to view URL]) has functions for all FedEx APIs but I only need a wrapper for the Rate Available Services one. I have also included FedEx documentation on the APIs as well as 1 include file that the main class references.