Hi @MG18,
'ONLINE' mechanism is mainly used for online transactions such as online bill payments.There are no dedicated scenarios for ONLINE mechanism type like WIRE. But, any existing scenario can be used for ONLINE transactions as well considering your requirements.
Please try to find out what kind of money laundering business want to identify on these particular transactions. In case there is no specific case suggested by the business for these transactions then you can club these transactions with generic scenarios where almost all transactions are being considered.
Hope this will be helpful.