Amazon Web Services - Product Advertising API - program modification incorporating signed requests

I have a functional application which I believe is written in Visual C++ or C# that incorporates Amazon Web Services functions (Product Advertising API) and XML parsing.? Amazon recently announced that all calls must now be "signed requests", with the cutoff being August 15 (4 days).? I need someone to add the necessary code to my current application? that will? produce a signed request? and therefore allow my application to continue running. Here is a link to the general overview of what will be needed: [[login to view URL] ][1] Here is? also a? link to the sample code Amazon has provided: ? <[login to view URL]> If you? can use the? sample code that Amazon has provided, that is completely fine.? I? don't really have a preference as to how it is? done, but this requirement is a bit above my head? technically, so I need someone who can read these requirements, make sense of it and add to my current application.? Again, I need to have it done rather quickly as they will flip the switch in 4 days.