The optimized targeting launch has been postponed. Line items will continue to use the targeting expansion feature and the targetingExpansion field of the LineItem resource will continue to behave as it has previously.

ReservationType

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Possible reservation types for a line item or insertion order.

Enums
RESERVATION_TYPE_UNSPECIFIED Reservation type value is not specified or is unknown in this version.
RESERVATION_TYPE_NOT_GUARANTEED Not created through a guaranteed inventory source.
RESERVATION_TYPE_PROGRAMMATIC_GUARANTEED Created through a programmatic guaranteed inventory source.
RESERVATION_TYPE_TAG_GUARANTEED Created through a tag guaranteed inventory source.