is there any app to secure credit card information from my iPhone5S?

i just buy new iPhone5s and i'm not sure about any security app which can help me improve my privacy protection. i have heard about Leo privacy guard, which

is free application so bit confused with should i use it or will it gives me all round protection or i need to pay after some time?
i even wanted to know what will be the best application for antivirus and image editing as i'm new with iPhone.
is there any other app for security or should i go with Leo privacy guard?