We guarantee installation/files delivery within 24 hours if the order is placed during a weekday otherwise 48 hours. We offer 100% money back guarantee if we fail to make the module work on your website. We have tested the module with default oscommerce cart installation and cre loaded carts. The module does not require any changes in your existing oscommerce installation. It just requires copying 2 files in oscommerce directory structure and installing module from the oscommerce admin area. You are all set to process payments from your system now. MyVirtualMerchant has officially included our module in their supported carts list. Please see https://www.myvirtualmerc hant.com/VirtualMerchant/ compatiblecart.do to confirm.