Attention! Luxchecker appears to be bogus service, charging $1 for nothing.
I checked more than 10 dumps with random exp date and random cvv1 from track2. All got approved. Basically it approves everything - even cards canceled by banks showed approved.
There's no sense to use this service. Basically all they can do for $1 is to check card 16-digit code for Luhn's algo validity and that's it.