chargify/active_merchant — pull request #3 by shayfrendt (2012-06-15 19:40:59+00:00)
Title: Pass cvv on card update

Always passing the CVV allows for "updating a credit card and explicitly
verifying the card" at the same time:
https://www.braintreepayments.com/docs/ruby/general/card_verification#credit_card_api