Secured login and payment options

I am looking to create a secured login for my customers. I would like for them to be able to purcahse via:1. Autodeposit, 2.Credit card(not including amex).

In addition, i have individual calendars that i have created for each customer that is in PDF and excel format and possibly another live format that would autoupdate for the user.

I know that this is rather complicated, but if anyoene can atleast direct me where to go that would be excellent