Google: write campaign-level negative keywords and shared negative keyword lists

Negative keywords live in three layers: ad group, campaign criteria, and shared negative lists. GET /v1/ads/keywords returns ad-group negatives, and the other two layers are readable through the GAQL passthrough (campaign_criterion,
shared_criterion). On a real customer account we see 1.712 ad-group negatives, 870 campaign-level and 516 in shared lists — so the majority of exclusions is in the two layers we cannot write.

Practically, most wasted-spend exclusions belong at campaign or shared-list level: a term that is irrelevant for the business is irrelevant for every ad group, and putting it in one ad group only moves the spend next door.

Request: write support for campaign negative criteria and for shared negative keyword lists (add/remove, and attach a shared list to a campaign).