New POST /v1/campaign:discover and PATCH /v1/campaign/{campaign_id}/recipient/{recipient_id}/entity_ui:status endpoints added for Entity-UI Next Best Actions, along with new entity_ui_status, entity_ui_status_updated_at, and resolution fields on campaign recipient responses
Each recommended action returned by POST /v1/campaign:discover carries an nba.cta whose type is journey, workflow, or flow (a flow template ID); the previous url CTA type and the nba.cta.label field are not part of the response