Setup SAAS Server for Subdomain and Custom Domain Redirection

Hi, I'm setting up a SAAS app and need help with the Server configuration where I'm handling Wildcard subdomains. I need help with - 1) Customer can use their custom domain name in place of [login to view URL] 2) Customers can access their portal from [login to view URL] Please note, I have already setup 2) Point but need a fully working combination of both keeping the https working. Only apply if you have already done the similar job. Will not be more than 20 mins job for the right guy.