SSL connections + Domain aliases

How to make SSL connections for exchanging trusted information?

Who is responsible for the Domain aliases (http://my_alias.my_site.com)?
The Domain provider or the Webmaster? In any case a test I made it never reaches my web app, so it must be one of them responsible.

In advance, a payment system with credit cards (hate it) must be from some international organization in order for the users to feel confortable? What is the proper way. Is it some agreement with a bank?

Lots of questions, but they need some answers. :rolleyes:

"Aliases" are actually DNS records in the name server that controls your site. So whoever maintains the DNS servers is the one that would be responsible for adding new entries.

Credit processing info:
http://www.thesitewizard.com/archive/creditcards.shtml