Is PayPal secure?

Hey!

I was thinking about PayPal payment on my OpenCart Shop. Is it easy to hack it and take my PayPal ACC an PASS?

you don't enter your paypal password into opencart... so yes its safe

So what is * Encryption Key:*?

anything you want it to be. It is just a hash that is used to encrypt the order id when sending between servers. Really it should be used to encrypt the whole thing as doing just the order id is pretty mundane, but i digress.
Just put "12345" or "ABCDE" or "12AB5" etc

Great thanks!