When buying by way of a web-based merchant, never give up more information more than you need to.  Simply give the needed details to finish the deal. A number of cons are executed via e-mail. If you get a geniune-looking e-mail that requires you to make your details up-to-date on a very important finance account, make sure to never click the website link they have already furnished. Instead, proceed to the website directly and see if an update is really necessary.