Need a payment module that POSTS to gateway

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Does anyone know of a payment module that is pretty basic and one that POSTS the form values to the gateway instead of using GET or XML request/response? I need to find one to use as an example so i can create one for a new credit card processor for us. 3Delta Systems is who it'll be hitting on a secure asp page. I have created a test form that sends the required fields to it and it functions, now am just trying to do the same within a payment module and am not having much luck. If i had an example module to work with I think I can do it... hopefully someone here can help me out.