How to use the creditcards.cvc.isValid function in creditcards

ngModel.$validators.ccCvc = function (value) {
          return ngModel.$isEmpty(ngModel.$viewValue) || cvc.isValid(value, $parse(attributes.ccType)(scope))
        }

errors.expirationMonth = i18n.translate( 'Choose the expiration month from the list.' );
	}

	if ( ! values.expirationYear ) {
		errors.expirationYear = i18n.translate( 'Choose the expiration year from the list.' );
	}

	if ( ! values.countryCode ) {
		errors.countryCode = i18n.translate( 'Choose your country from the list.' );
	}

	if ( ! errors.number && ! card.isValid( card.parse( values.number ) ) ) {
		errors.number = i18n.translate( 'Enter your number as it is on your card.' );
	}

	if ( ! errors.cvv && ! cvc.isValid( values.cvv ) ) {
		errors.cvv = i18n.translate( 'Enter your security code as it is on your card.' );
	}

	return errors;
};