This suggestion is in reference to Dropbox Passwords.
Whenever you enter payments online on a vendor's site, in addition to the name on card, card number, and expiration date, you'll be asked to provide the 3-digit verification number. That's the additional field I was suggesting. Users can include this information in the entry's Notes, of course, but it would be easier to have it as a field, after Card number and Expiration date. Then again, Billing address could be useful as well. 😉
Card security codes have now been added to the Dropbox Passwords extension as of today! They will be added to the iOS & Android apps as well in the near future. Thank you.