//Use the WithdrawalCashBatchOrder_Fill method
var client = new BFSServiceReference.bfsapiSoapClient();

var credentials = new BFSServiceReference.Credentials()
{
    UserName = bfsusername, //Username of administrative user in your instance of BFS
    Password = bfspassword, //Password of the administrative user in your instance of BFS
};

var target = client.WithdrawalCashBatchOrder_Fill(new BFSServiceReference.WithdrawalCashBatchOrder_FillRequest()
{
    Credentials = credentials,

    identify = bfsidentifier, //Identifier is a unique token for your instance of BFS 

    WorkflowTriggerDataEntity = new WithdrawalCashBatchOrder_Fill()
    {
        BrickId = new Guid("fa0172e0-79ff-4d72-a49e-6a1b70519e50"),
        SettlementDate = TimeZoneInfo.ConvertTimeToUtc(DateTime.Parse("2016-04-25")),
        ValueDate = TimeZoneInfo.ConvertTimeToUtc(DateTime.Parse("2016-04-25")),
        TradeDate = TimeZoneInfo.ConvertTimeToUtc(DateTime.Parse("2016-04-25")),
    },

});

Console.WriteLine(target.Message);