For raffles, etc each group can run credit card purchases through their own credit card set up. For the silent auction, costs are run through the company handling our mobile bidding (One Cause/BidPal). We just pass on the bank/card costs, and make no profit on this. Every booster group is assigned a two digit prefix (e.g., Aquatics is 11, Band-Jazz is 12, etc.), and then each auction item gets a 3-digit number. This way, in the case of a discrepancy, we will know if an item has been paid for or not. Clubs MUST use this numbering system, because invariably some person pays at the wrong club, and these numbers are how we get everything settled up correctly after the fact.