VoucherUsageStatsStatistics for voucher usage.FieldsaverageDiscountMoney!RequiredMean discount per redemption.totalDiscountGivenMoney!RequiredTotal discount amount given across all uses.totalUsageInt!RequiredTotal number of times the voucher has been used.uniqueUsersInt!RequiredNumber of unique users who have used the voucher.VoucherTemplateEdgeVoucherUsageSummaryBuilt with