Hi
A payment gateway for Eurobank Greece is already built in to Cs-Cart since version 1.3.5
Now you can use installments (with interest) for versions 2.1.x and 2.2.x.
All you need to do is set your amount of installments, the interest and the price range for that installments (for subtotal over 200€ and under 500€, 5 installments and 2% etc) and you are done.
Customer can then choose in checkout to pay the whole amount at once or use the installments with interest
In the order summary before order confirmation , he will be informed for the extra charge of ,interest, just like the shipping charges.
For Addon price and more information please contact as to info@dvs.gr
Fotis