customize current shopping cart software

Need PHP professional to customize current shopping cart software. Shopping cart software is by www.comdevweb.com. YOu can go to their website, download their trial version of the ecommerce software and look at the files, PLEASE! I need to find out if you can add a specific Gateway company to the gateway list so that the software is compatible to a specific gateway company (will let you know gateway company after you bid) and also to edit the files to add radio buttons for multiple selections of shoe strap/lace colors. Currently the software doesn't allow for selection of colors (additional accessories to a specific product). Please look at the files mentioned above before placing a bid and let me know what your turn around time would be to get this accomplished. thanks!