Store and Shopping Carts

I am about to take a job to make a flash site for a small clothing company. They are super small, the site will be around 3 to 4 different pages. I am doing it all in flash, because they really want their site to look better. The issue I have is they are currently selling a few items on their site using a paypal account, so would I have to add the store into the flash document or what… I just need to know how to make the store work within the flash. I have never done a store within a site and I really don’t want to have to deal with anything where I have to deal with people’s credit cards. Please advise. Any tutorials / guiudance would be of big help.

here is the current site. as you can see they need the redesign and that baby kinda creeps me out.