I am planning to build a website, where users would register, add their private data such as interests, password, email, nickname, age, gender and etc. Also use their Paypal or Credit Card to deposit money to their virtual accounts. The question is: what I need to know about keeping customer private data secure? I know that I have to encrypt passwords, also let users to see their private data and etc. But do I need to confirm any international privacy standards to be able to collect information globally? Thank you.