I think this will do what you want, but I'd be cautious of using anything that keeps a live link between your site and another site, such as PayPal.
Also note this MOD is not from from here, so support fo it may not be found here. However I have found that phpbb Hacks does provide good support for the MODs they have.
My nick, Waiting on God, means that I am waiting on God to do something wonderful!
"I don't know everything. Never said I did. I just know a lot of things, some of it useless, some of it important. It's up to you which is which."