Card Payment Service via Redirect for a custom made Javascript Checkout osCommerce2.2

General information for the website: tonerfox.gr selling Toner Cartridges and Toner Powder for Refill
Kind of development: Customization of existing website
Num. of web pages/modules: 1 Credit Card payment module
Description of every page/module: 1 Credit Card payment module custom build with Re-Direct
Description of requirements/features: Description of requirements/features:
Platform osCommerce v2.2 RC2a
1. The problem: On Checkout the customer can not pay with Credit cards.
2. The reason why can not: The checkout is completely different form, made custom with javascript and not the standard OsC checkout.
3. The solution:
The developer has to build a custom card module from the bank requirements in order to accept cards payment The checkout has now total 2 shiping options (Send by Courier, Pickup from shop) and 2 payment options (Cash On Delivery, Bank Deposit) and the Developer has to simple add a new payment method by Credit Card.
My Bank (Alpha-Bank) has sent me the Instructions called
"Technical instructions for the online business interface with the Alpha e-Commerce Service via Re-direct"
The Original site is in Greek Language but I have a copy folder with the whole site in English and the programmer can do the job there and when the job is done and everything is tested and working I will change the files from the Original Site.
Payment methods: Credit Card
Specific technologies required: javascript, PHP, MySQL