Privacy & security
You sign in with your 12-digit number and a password. The same number is your referral id if you use it; whether and how is up to you.
We usually do not need your name or e-mail. If the payment route or the law really require more, we only collect what is needed, for that purpose and in a separate step. The connection to the site is encrypted and the session is protected. Full data-protection information and your rights (e.g. access): see Legal.