Identification code associated with the list to which you want to add the leads. The list ID is a 4-6 digit number which can be found within the URL after the #SL. To find a list ID, open the target list in Marketo.
Identification code of the leads you wish to add to the list. You can find a lead's ID by using the Search Lead action in Marketo. Note: you can add a maximum of 300 leads at a time.