My CCBill master account number is 539409 but I use each site's account number in their link codes.
Example
Code:
http://refer.ccbill.com/cgi-bin/clicks.cgi?CA=913226-0003&PA=656559
This number "913226-0003" is the site's account number
This number "656559" is my affiliate number for that site.
When you login to your CCBill admin you need to go under tools to see what the correct link code is for each site.