Some customers have multiple payment options (credits and/or memberships) in their accounts to take classes. The order in which the system organizes them by default is as follows:
Members only memberships (or guests only memberships if booking for a guest ordered) by the purchase date
Members and guests memberships ordered by the purchase date.
Members only credits (or guest-only credits if booking for a guest) ordered by the soonest expiration date
Members and Guests credits ordered by the earliest expiration date
