payment gateway similar to Groupon

I want a system similar to groupon. I didnt decided yet which site and script is better. But I think gripsell daily deals software is better for me... You can give me advice for better scripts and less price. After that we have a problem with the payment gateway. I shouldn't use paypal or authorize.net. I want the developer must create a payment gateway system for my site. I didn't get the codes from the bank. But the banks are using very similar codes in Turkey. I'm looking for experienced developers with groupon and Turkish banks. pm for the detailed questions...