According to this blog post from Developers Marketo: http://developers.marketo.com/blog/important-change-activity-records-marketo-apis/
It appears as if the changes only really affect getting related leads information.
I'm a web developer for my company, and we have a couple of sites that are tracking anonymous / known leads via the MunchkinJS plugin.
My question is, if all we're doing is using MunchkinJS to add new leads, and update leads to become known leads.
Is there any changes that need to be done on our end regarding this API change?
It appears that MunchkinJS using the email as the unique identifier, not the id or leadid fields.
Any help would be appreciated!