Duplicate Emails and associateLead() - are all records updated?

[Edwin_Afable1]

I'm thinking of using associateLead() to associate anonymous web data to known records. What happens if there are multiple records with the same email address? Which one(s) receive the update?

[SanfordWhiteman · Accepted solution]

It wouldn't make sense to associate web activities with more than one lead. Only one lead can own the activities.

I believe the last updated lead gets the update here (with a minority of endpoints, it's the earliest created lead, have to recheck this API call to be sure).

Across the API, you should expect an update/upsert call that accepts a single lead identifier to update only a single lead (even in other cases where multi-update would be practical).

[Edwin_Afable1]

Thanks Sanford Whiteman​ - I didn't want to assume