I have read your project description, and i understand what you need. I quickly searched web for existing solution, and Secure Pay already have module for CS Cart, so it's only matter of installation, and proper configuration. If you want to know something about me, i'm web developer, i have strong knowledge of LAMP (Linux, Apache, PHP, MySQL), HTML&CSS, JavaScript (technologies used by CS-Cart), and over 10 years of experience in web development and administration, so i believe i can easily get this project done for you. I will need temporary login to your websites FTP, and administration, and also TESTING merchant id and password for testing of the payment processor (after testing you will have to change it to real merchant id / password, but it's really simple). If you have any question or more information, please don't hesitate to post them by private message.