Just to clarify, as this is important for me. I am building an application to create and manage campaigns. And these campaigns may have been created via AdWords UI.
What you stated above does not restrict me from adding FeedItems, using the API, into the feeds created via the UI right?
For a Campaign that is created from the AdWords UI and with extensions added via the UI, is there a particular service that I must use in order to manage its extensions? I assume I should not use FeedServices to manage these campaigns.
If possible, I would like to use ExtensionSettingServices exclusively (without FeedServices).