add e-commerce to cart

[ggalan]

ive made and modified a cart from this tutorial
http://www.studyblog.net/2008/11/a-simple-php-shopping-cart-script/#comment-443

it works fine but if i wanted to add a commerce check out, what would i need?
should i first get a HTTPS SSL certificate then a merchant account?

[ggalan]

does anyone have experience w/ authorize.net?

http://www.developer.authorize.net/