Credit card validator, Luhn algorithm check, card number verification, card type detector, Visa Mastercard Amex Discover Diners JCB UnionPay brand identifier, PAN validation

Credit card validator, Luhn algorithm check, card number verification, card type detector, Visa Mastercard Amex Discover Diners JCB UnionPay brand identifier, PAN validation. Validate credit card number via Luhn algorithm and identify card brand. Returns validity, card type, masked number. No payment processing, validation only.