def update(attributes)
      warn "[DEPRECATED] update as an instance method is deprecated. Please use CreditCard.update"
      result = @gateway.credit_card.update(token, attributes)
      if result.success?
        copy_instance_variables_from_object result.credit_card
      end
      result
    end
def update(attributes)
      warn "[DEPRECATED] update as an instance method is deprecated. Please use CreditCard.update"
      result = @gateway.credit_card.update(token, attributes)
      if result.success?
        copy_instance_variables_from_object result.credit_card
      end
      result
    end
Deprecated. Use Braintree::CreditCard.update