public async Task RejectSettlementVanillaTest()
        {
            var receivableSettlementItem = new SettlementReject
            {
                Key           = ("df78ff30-1825-4922-b26f-856f28652c1e"),
                ReasonDetails = ("Liquidacao nao executada.")
            };
            var settlements = new List <SettlementReject>
            {
                receivableSettlementItem
            };
            var receivableSettlementInput = new SettlementRejectRequest {
                Settlements = settlements
            };
            var result = await _settlementService.RejectSettlement(receivableSettlementInput);

            Print(result);
        }