Eventually you will purchase online. Most things like bank forms are secure what they don't tell you is if your account is pilfered it is most likely due to your computer being infested by a virus, trojan or whatever. I read about several small business operators who worried about entering information into online banking forms but the bank officials told them the forms where absolutely secure.
Again , what they didn't tell them was if their computers became infected then entering information into the online banking forms could be had by hackers.
Eventually, they lost thousands of dollars because a keylogging program on their systems recorded information as it was being typed into the secure bank forms. Yes, the courts sided wit the banks and the banks never paid back the money and those small business owners learned a valuable lesson: security starts at home>