I'm certainly in favor of code reuse and OO and input validation, but the actual functionality here is so small that it hardly seems worth it. I do this in my own code with this sub:
sub _safe_card_number {
my ($class, $card_number) = @_;
$card_number =
'X' x (length($card_number) - 4) . substr($card_number, -4);
return $card_number;
}
I could imagine someone wanting to change the 'X' to something else, but leaving the last 4 characters is pretty much universal from what I've seen.
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