Never done this but how difficult is this to do?

I am creating a store with a ecommerce package but don't know how much work or time is involved in seamlessly linking paypal to the shopping cart. (Php/MySQL)

What is involved and can I have it so it looks like its actually inside my site?

Thanks!

Your ecommerce package should have payment integration options. Look there to see if it has PayPal integration out of the box.

On the PayPal side, of course, you have to set up an account to integrate with.

Yeah, and copy the link and add it, doing this thing takes just several minutes if even it. easy stuff