public static function creditCardCardType()
{
return new MultipleValueNode('credit_card_card_type', [CreditCard::AMEX, CreditCard::CARTE_BLANCHE, CreditCard::CHINA_UNION_PAY, CreditCard::DINERS_CLUB_INTERNATIONAL, CreditCard::DISCOVER, CreditCard::JCB, CreditCard::LASER, CreditCard::MAESTRO, CreditCard::MASTER_CARD, CreditCard::SOLO, CreditCard::SWITCH_TYPE, CreditCard::VISA, CreditCard::UNKNOWN]);
}