SFDC Integration App - Create vs Update Campaign Members

Hi all,

I'm looking for insight from someone who's been able to successfully migrate their integration from the native/program builder to the SFDC App. My question is specifically around the Action to Create/Update Campaign Members.

In Program Builder, the external call to Create Campaign Members acts as both a Create or Update call. Ie. if a campaign member does not exist in the campaign, it creates a new member as expected. But also, if the campaign member already exists (same Lead/Contact), then the call will update the existing member. This functionality has allowed us to trigger the campaign association with a single external call and not have to worry about saving Campaign Member IDs in Eloqua and the complexity that comes with the 1:many relationship between Contact:Campaigns.