Is there an option to add the History ID in Gmail? I'm trying to create link between an event notification and cancellation notification from google calendar and this is the only field that seems to have consistent information in both emails. Here are the two recipes I'm running. Basically, I'm adding an activity to quickbase when I get a calendar notification from Gmail. I need to reference a consistent ID that would carry over to the cancellation email to clear the activity out of quickbase.