An email address is needed for verification. A password is ofcourse recommended to change your QRgan-card later on. You can also decide if a simple "captcha" style of verification is needed before displaying your QRgan-card. You can change template or function of your QRgan-card at any time. Your business card information will ofcourse not show if you decide to use the card to redirect to another page instead. However your date is saved and if you choose to go back to a business card template, your data will be intact. [create] email and pw in db.