(Maitre'D 2003, from Service Pack 7 and Maitre'D 2005)
You can partially hide the debit card number to show the first 10 digits
and mask the last 4 with 'xxxx' on the voucher for
the NCR and Datacap Datatran protocols.
Electronic Funds Transfer / View / Options / Operation
Alternate Card Masking:
Enable this option to show the first 10 digits and mask the last 4 on the
Debit Card voucher instead of hiding the first 10 and showing the last
4.
Note: Also enable the Hide Card Number option in P.O.S. Control / Payments
/ Media Types / Card Property, which partially masks credit card numbers
as well.
