Create a topic

Create a subscription topic — a category recipients can opt out of on their own (e.g. Promotions) while staying on your list. default_opt_in decides whether contacts with no explicit preference are treated as subscribed. Scope a campaign to a topic so opted-out contacts are skipped automatically via Create a campaign, and set an individual contact's preference with Set a contact's topic preference. Topics differ from segments: a segment decides who a campaign targets, a topic lets recipients opt out. Requires the topics:write capability.