The one rule
Money that has not been released to the organizer can always go back. Everything on this page follows from that, and from one fact about how the money moves.
A sponsor pays the whole amount when they buy. Door Money holds it, and releases the organizer's share under the fundraiser's terms. Those terms depend on the category, and the next section sets them out.
Door Money returns its 15% on whatever is refunded. The fee is earned by a sponsorship that was delivered, not by taking the payment.