This article explains how the PIN on the ticket is used to pay for the violation
The additional dash and 2 digits at the end of the violations are known as a "Ticket PIN".
It may look like it's part of the ticket number, but it's not. It's only used as a password for the ticket when appealing it.
As an example when creating a violation, it appeared as 2-001017-12. The actual internal ticket number is 2-001017, same format as it has always been. If you search violation 2-001017 in violation search it will appear as 2-001017.
Additionally, if someone did type in the ticket number and PIN (2-001017-12) it would return the same ticket.
This means the reports in the FTP file, for example, will only reference 2-001017 as the ticket number, not the additional -12.
Additionally, the code that generates the FTP files isn't going to change/add the pin.
FTP reports will remain unchanged by the addition of the violation PIN. No PIN will be shown in the mailed out the violation.
The PIN is only used when appealing tickets if the user isn't logged in. As an example, you can see the "Appealing a Ticket" box on the login screen here.
The PIN is used in that box to give some protection from public users just looking up sequential ticket numbers.
Once you click check you will be presented with a screen that allows you to appeal or pay the ticket.
Notice when the record of the ticket is found it does not include the PIN.