I'm in the process of building an integration between our own CRM system and Hubspot. One major thing for the users would be the possibility to synch timeline events to keep track of everything a contact has received and done in both systems.
From what I've learned this far, this is not possible using the API. BUT when I got hold of the documentation for the salesforce API: documentation
It seems like you are able to do it using their integration (I got it from a user demanding that I fix it since salesforce could...). Do they have access to some not yet official part of the API which I can wait for or have I just missed something somewhere in the API and forums?