I find out that in Credit cards some frequently used fields has missed, like are:
1. Verified by Visa (aka 3D Secure) or MasterCard SecureCode (MCC). It's not the same as CVC/CVV (Verification Number)! It's password you set online at first usage of your card online. See for more details;
2. Phone access password. Some banks allow to enter it via DTMF (keypad on your phone), but sometimes you need to say it to operator;
3. Account # belongs to this card (aka Special Card Account). It's differ from card #. It' needed e.g. if you want withdraw money when your card has expired and you will no prolong it. Also it can be used to transfer money inside e-system of your bank issuer.
4. Credit billing date (just day of month). You need to know billing date to calculate free period for credits.
Please investigate possibilities to add them.