Just make sure you have an SSL certificate installed. Personally, I use COMODO;
and for free they conduct daily security scans of your site. They also let you show their hacker guardian seal for a small fee - though, from what I understand, its still the same security scans. Just more frequent.
You know; while I`m not a hacker either, I think its something of a misnomer thinking that hackers are responsible for the majority of credit card fraud. I would think that the `hacked credit cards online` are more of an issue between collusion of the business owner or an issue of not having an SSL certificate at all.
Hacking is hard - so I hear. Think of all the alternate ways there are to get a credit card number. Easier ways.
Do you ever use your credit cards to pay for dining? Do you follow the waiter into the kitchen to swipe it? Do you shred all your documents? Do you break eye contact with your card when paying for an oil change from Pep Boys (they`ll rip you off in other ways too)?
Well, I trust my point has been made. I would advise you to look at hacker safe as nothing more than a brilliant marketing ploy - which is what it is (unless you run a political site).