This content has been marked as final. Show 2 replies
To the best of my knowledge the current functionality of syncLead does not merge an anonymous and a known lead based on Munchkin ID.
Anonymous leads can be updated using the Munchkin ID.
This is not possible via the syncLead API. I would reccommend looking at mergeLeads API. If you know the Marketo ID of two leads, you can merge them together.