The fundraising director/representative that you are working with will help you with enabling the prize shop. The prize shop for a rep lead fundraiser can be split between both the group and the rep.
If you are running a self serve fundraiser (you do not have a fundraising director or representative helping you with your fundraiser) then you will be solely responsible for the cost of the prize shop.
After the campaign ends, Participants with at least 2,500 coins will get to shop from the Prize shop.
Each coin is worth $0.01
2,500 coins = $25
The fundraiser will be charged for all coins that participants earn once they hit 2,500. If there is a participant that does not hit 2,500 - you will not be charged for those coins.