Authorize.net customization of a ASP.NET/C# eCommerce websi

This eCommerce ASP.NET/C# website uses [login to view URL] as payment gateway service (Transaction is processed on [login to view URL] site). Need some customizations done on the Payment Form page and Payment confirmation page, such as showing correct transaction info, user info etc. and also need to add a template to this page. The site already uses a masterpage as site template, need to integrate that template on this transaction form page and confirmation page as well. Please note: 1) You MUST have experience working with [login to view URL] system, their DLLs etc. Please send me some sample work. 2) You MUST be able to work during the USA weekends (Saturday/Sunday) 3) You MUST need to use MSN messenger for communcations