Add cradit card payment to groupon script

Hello I have a script of groupon site. Ther is already few typs of payment getway. I need to complet adding 2 payment getway. This is cradit card payment getway and i have api document. Old developer did 80% but he cant complet the work becous he is sick. Need only only 3+ codeiginetor profashional only to complete this work. This is the site. [login to view URL] Thank you