Add ClickBank and Authorize.net Payment Module to existing Wordpress Plugin

Hello, I have a wordpress plugin that was written for me. It was designed to accept multiple payment modules, but was designed with just one. I have come to the point where I want more than one module. At the moment it uses a paypal module, but I would like you to investigate the possability of making 2 extra modules (one for ClickBank and one for [login to view URL]), creating a minimum of 1 final payment module. This should only require the coder to create 1 or 2 files and should not take long at all for an experienced coder. As far as I can tell both clickbank and [login to view URL] provide all the details you should need to complete this. I know that a module for [login to view URL] is possible, but I have some doubts about clickbank due to the way that wordpress operates. This is why I have mentioned investigating 2 modules and making a minimum of one. Both clickbank and [login to view URL] provide details of their payment systems and I can give you all the links you need from the research I have done should you need this. I am working on a very tight budget as the final product will be used on a charity website to assist them in raising funds through membership and donations. I will not put up with coders/programmers who are not serious or who do not reply for weeks on end. Please only bid if you are serious. Any questions, please let me know. Get your bids in as I will be closing this listing as soon as I find a bidder I am happy with. Many thanks