AI-generated Key Takeaways
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          The availability mode determines how the channel availability is formatted, indicating if it's available to all channels, a specific channel type, or a channel type and its subtypes. 
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          The advertising_channel_typespecifies the broad channel type where the category is available.
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          The advertising_channel_sub_type[]field lists the specific channel subtypes under the main channel type where the category is available.
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          The include_default_channel_sub_typeboolean indicates whether the default channel sub type within a given channel type is included in the availability configuration.
Information of advertising channel type and subtypes a category is available in.
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 Format of the channel availability. Can be ALL_CHANNELS (the rest of the fields will not be set), CHANNEL_TYPE (only advertising_channel_type type will be set, the category is available to all sub types under it) or CHANNEL_TYPE_AND_SUBTYPES (advertising_channel_type, advertising_channel_sub_type, and include_default_channel_sub_type will all be set). | 
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 | Channel type the category is available to. | 
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 | Channel subtypes under the channel type the category is available to. | 
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 Whether default channel sub type is included. For example, advertising_channel_type being DISPLAY and include_default_channel_sub_type being false means that the default display campaign where channel sub type is not set is not included in this availability configuration. |