sellerFeeobjectrequiredfeeBpsnumberrequiredminFeeCentsnumberrequiredmaxFeeCentsnumberrequiredcurrencystringrequiredholdsobjectrequireddefaultHoldDaysnumberrequiredmaxOpenHoldsPerBuyernumberrequiredupdatedAtobjectrequiredsellerFeestring or nullrequiredholdsstring or nullrequired