Modifiy OSContribution to work with Zen Cart (Intabill Payment Module)

I need a php programmer familiar with OSCommerce and Zen Cart to modify an OSCcommerce payment module so that it works in Zen Cart 1.3.8a The OSCommerce files from the payment processor Intabill are attached. ## Deliverables All four files need to be modified and then delivered to work in Zen Cart 1.3.8a