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Enum describing the different channel subtypes.

UNSPECIFIED Not specified.
UNKNOWN Used as a return value only. Represents value unknown in this version.
SEARCH_MOBILE_APP Mobile app campaigns for Search.
DISPLAY_MOBILE_APP Mobile app campaigns for Display.
SEARCH_EXPRESS AdWords express campaigns for search.
DISPLAY_EXPRESS AdWords Express campaigns for display.
SHOPPING_SMART_ADS Smart Shopping campaigns.
DISPLAY_GMAIL_AD Gmail Ad campaigns.
DISPLAY_SMART_CAMPAIGN Smart display campaigns. New campaigns of this sub type cannot be created.
VIDEO_OUTSTREAM Video Outstream campaigns.
VIDEO_ACTION Video TrueView for Action campaigns.
VIDEO_NON_SKIPPABLE Video campaigns with non-skippable video ads.
APP_CAMPAIGN App Campaign that lets you easily promote your Android or iOS app across Google's top properties including Search, Play, YouTube, and the Google Display Network.
APP_CAMPAIGN_FOR_ENGAGEMENT App Campaign for engagement, focused on driving re-engagement with the app across several of Google's top properties including Search, YouTube, and the Google Display Network.
LOCAL_CAMPAIGN Campaigns specialized for local advertising.
SHOPPING_COMPARISON_LISTING_ADS Shopping Comparison Listing campaigns.
SMART_CAMPAIGN Standard Smart campaigns.
VIDEO_SEQUENCE Video campaigns with sequence video ads.
APP_CAMPAIGN_FOR_PRE_REGISTRATION App Campaign for pre registration, specialized for advertising mobile app pre-registration, that targets multiple advertising channels across Google Play, YouTube and Display Network. See to learn more.
VIDEO_REACH_TARGET_FREQUENCY Video reach campaign with Target Frequency bidding strategy.
TRAVEL_ACTIVITIES Travel Activities campaigns.