Thanks Brad!
Although I have 2 suggestions:
1. First up is there any chance the ?mn=12345 will be indexed by google? If so could you add no index no follow meta tags?
2. the other thing that isn't ideal is the look of the ?mn=12345, could you not change it to magic letters which appears before the trailing slash (like version 2.0 of the original CPA Redirector)?
e.g. if the whitehat is: whdomain.com/whpage/, the magic letters could be:
whdomain.com/whpage-letters/ --> whdomain.com/whpage/ --> offer
as opposed to:
whdomain.com/whpage/?mn=1234 --> whdomain.com/whpage/ --> offer
I'd gladly be willing to pay for those modifications.
Cheers