payment gateway connection

I have an old .asp website; used to have online payment connected tehre. Later on I have someone built an onine registration site on php and connected my online payment there; and it is still working there. However, the old website was where I was selling hotels online. Thus, I need to make the old website live and work again with my existing payment gateway from a bank in Turkey. Can you do the payment gateway connecton to an old asp website? Or maybe better create hotel booking steps of old website in the new payment gateway working website? Either way is fine , prefer the second option. old asp website, where hotel booking steps are working fine ; but payment gateway is not working anymore : [login to view URL] or new registration website, where payment gateway is working fine but, this site is for conference registration only. Need to build above hotel info and booking pages inside this one; and conect it all with working condition payment gateway : [login to view URL] All my sites are hosted by GOdaddy; I will provide with user/pass of Godaddy to reach the codes. Gurkan