Gasboy CFN Series NBS - Manual (Page 32)

Using NBS Debit Card Processing
Page 28 MDE-4390F Gasboy CFN Series NBS (GL3) Credit and Debit Card Network V 1.3.0.0 · November 2008
Debit Card Processing
The GL3 network system uses a Derived Unique Key Per Transaction (DUKPT) method of
key control and PIN block transfer to the host system. To set up debit card processing, proceed
as follows:
• Ensure that the reader parameters are entered and correct for displaying the correct
messages. Review “Reader Parameters” on page 33 and MDE-4316 CFN III
Configuration Manual for Windows NT, Section 7 for setting up Fleet, Club and Debit
PIN prompting.
• Ensure that the sys_par parameters for the console, reader, and network are set to remote
checking. If the Bank PIN D.E.S. is not set to “yes,” the PIN pad will not provide any
debit PIN information and will generate the error message PIN PAD ERROR on the Profit
Point screen.
• Use the Load Key command to set the system into DUKPT mode. The data entered must
be exactly 18 characters, which consist of a two-digit ID followed by 16 zeros. The first
key type is “00” and the second key type is a one followed by an F (1F). Enter the
following commands (do not type the quote marks, they are for identifying the command
or data to be entered); indicates that you need to press the RETURN or ENTER
key:
• “load key”
• “000000000000000000”
• “load key”
• “1F0000000000000000”
• Set up the Profit Point keyboard to process debit transactions. A debit key can be set up
through the Profit Point configuration menu. Refer the keyboard configuration
information in MDE-4356 Profit Point Reference Manual.
• Debit cards always obtain their Fill pre-auth value from the Card Parameter Table (NBS -
C). Therefore, set the Fill Amt to a value that is reasonable. It is possible for debit cards to
be denied if the pre-auth requested amount is too high. Though bank systems should allow
a lesser amount to be authorized, it is not required, and many banks will just deny the
purchase. It is recommended that the Fill Amt be somewhere around the PS2000
authorization amount allowed.
Cash Back Processing
The GL3 system will allow cash back with debit transactions. A Gasboy product must be set
up as an enabled withdrawal product type and set up with the minimum and maximum amount
allowed with no tax. The product must be cross-referenced with the NBS cash back product
code. The merchant can provide cash back service by selecting the cash back product and
entering the amount of cash to be provided to the customer. The debit sale will be processed as
any other normal debit sale, with the exception of cash being owed to the card holder. The
receipt will list the cash back Gasboy product and the amount. This provides the customer
accurate information about the sale and the amount of cash back.
For site version V034J, or less, and for NBS GL3 router version 1.2.0.0 or less, cash back
should not be allowed for preset to “fill” transaction. Later versions are certified to run cash
back transactions using the preset with “fill”. Cash back transactions can be processed with
standard post-pay sales and prepay or preset transactions where the amount of fuel allowed is
set by the merchant. Later site or NBS GL3 router versions are certified to perform cash back
operations in the “fill” mode of preset.