If you have your own merchant account do you keep (are you responsible for) credit card information for your customers? I'm getting merchant account in 2 weeks and I don't want to be responsible for keeping CC info. Is there a way to do that? If I must keep the CC info, what is the best way to do that, what software do you use? How do you keep it secure? Are you responsible if client CC is compromised?
I'm completely new to this and any help is appreciated.

Thanks in advance,
Peter