Ask HN: Automated Money Transfer, how?

Hey, guys sorry for my dumb question, but I never heard about a method to transfer funds from one account to another using programming.

I mean, I want to automated all parts of my web site, and there is a part where I have to transfer funds to some accounts(persons) is there a way to do that? Like mail the person with something to print or online transfer or things like that?

If there is more than one can you tell me? Thanks