Zen Cart / Optimal Payments - Need to have a payment module created for this

I am using the latest version of Zen Cart and need to have a payment module created to work with the Optimal Payments system. You can find details of Optimal Payments here: [login to view URL] You will need to have a good knowledge of how ZenCart works and also how the Optimal Payments API works in order to get this to work. Payment will be on receipt of a working module. I need this module created as soon as possible so shorter timescales would be prefered.