qbolines.cs

      new Line
			{
				DetailType = LineDetailTypeEnum.PaymentLineDetail,
				DetailTypeSpecified = true,

				Amount = amount,
				AmountSpecified = true,

				LinkedTxn = new[]
				{
					new LinkedTxn
					{
						TxnId = id,
						TxnType = type
					}
				}
			};