Your ATM/Debit Card Number, which is the 16-digit number on the card you received by mail after opening your account. This card is also known as the Citi® Banking Card. If you did not receive one, Contact Us by Chat.
Your PIN, or Personal ID Number, which is the 4-digit code you created when you opened your account.
Your Account Number, which is the number of any Citi® account linked to your ATM/Debit Card, such as your checking account. Alternatively, you can also enter the last four digits of your Social Security Number.
For your credit card, you will also need:
Your credit card number.
Your credit card security code (the last three digits on the back of your MasterCard or Visa card, or the four digits on the front of your American Express® Card).
Your date of birth.
The last four digits of your Social Security Number.