We have classic Zen Cart shop. Paypal is integrated and working. We would like to replace it with Card Save.  http://www.cardsave.net/
The problem is their given files are general PHP and not ZenCart modules.
We think it wont be any problem to do this if you are experienced PHP coder and know how Zen Cart works.
We would like to have this done as soon as possible. Successful coder might expect more work maybe on regular basis.
Please do not bid if you are not sure that you can do this or you dont have any rankings.