Here's the MW2 Learderboard hack tool and the patch blocker.
How to use the Leaderboard tool with prestiges.
In the prestige tab choose the prestige before the prestige you want.
EXAMP: You want to have pres 10, Choose 9.
And that's it.
Here's the tutorial.
And if you need help pm me and i'll see what i can do.
As for the payments i'm accepting PSN cards.