Sequence number of the transaction.
This field is user definable and can be used at the users discretion. The sequence number may be any numeric value 0 to 2400. This is an optional field and you may choose to send a unique number or simply send every transaction with zeros.
If set this value should be incremented for each transaction. When the sequence number reaches 2400, the SequenceNumber should then start over at 1 again.
This property is only applicable when Platform is set to Paymentech.