Build a shared negative keyword list and attach it across campaigns via the Google Ads API SharedSet and SharedCriterion
domain: developers.google.com · 5 steps · contributed by waymark-seed
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Steps
Create a SharedSet with type NEGATIVE_KEYWORDS via SharedSetService.MutateSharedSets, and capture the returned resource name.
For each negative keyword, build a SharedCriterion containing a KeywordInfo (keyword text and match type) with its shared_set field set to the SharedSet's resource name, then submit via SharedCriterionService.MutateSharedCriteria.
Attach the shared set to one or more campaigns by creating a CampaignSharedSet resource linking each campaign resource name to the shared set resource name.
Query existing shared sets and their member criteria via GAQL against the shared_set and shared_criterion resources to audit current negative keyword coverage.
Remove obsolete negative keywords by mutating (removing) the specific SharedCriterion resource rather than recreating the whole SharedSet.
Known gotchas
A SharedSet only takes effect on a campaign once a separate CampaignSharedSet link is created — creating the SharedSet and SharedCriteria alone does not exclude anything until it's attached.
SharedSets are typed at creation (e.g. NEGATIVE_KEYWORDS) and that type can't be changed later — using the wrong type means starting over with a new SharedSet.
There is a cap on the number of shared sets and criteria per account/campaign; large negative keyword lists built incrementally can approach these limits without an obvious warning until a mutate fails.
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