Add a card type
It would be very helpful to have a credit card (or other card) type of field in addition to logins and notes. BitWarden currently does this and it's a helpful distinction since filling in credit card details on websites is a pretty common occurrence. I've currently added credit card info as notes but that doesn't enable me to automate the filling-in process on web-based purchase.

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David Houston commented
MasterCard allows the creation of virtual card numbers for use online, so that if an account it compromised you don't have to get a new physical card and redo all of your auto-pay accounts, etc. I am a heavy user of the virtual account numbers, so I have a dozen or so different credit cards to track. When I just used a physical card everywhere, this feature wasn't that important, but with all the virtual account numbers this feature becomes very helpful.