Hi paul,
There shouldn't be anything that you have to sort out. If 10 players enter a club tourney @ 100 credits each, then 800 credits are available for the purse. That provides the payout for club competitions automatically since the purse is provided directly by the players themselves.
A club "treasury" sort of thing has been discussed, but due to the restrictions on some states/countries it wouldn't be able to be used as a payout point. We have some other ideas that we're kicking around for the use of a 'treasury', but nothing has been set in stone quite yet.