Add Negative Keyword

Adds negative keywords at CAMPAIGN or AD GROUP level (to stop wasted spend) — ONE keyword or a WHOLE BATCH in a single call.

BULK (one call, one confirmation, one credit for any number of keywords): keywords is a list whose items are 'text' (takes match_type, default PHRASE) or 'text|EXACT' / 'text|PHRASE' / 'text|BROAD', exactly like manage_shared_negative_list. A comma- or newline-separated string is accepted too. Up to 5000 per call. The batch goes to Google as a single mutate with partial failure ON, so one bad or duplicate keyword does not take the rest down, every keyword comes back with its own ok/criterion_id/error, and nothing is silently dropped. skip_existing=true (default) first reads the negatives already live on that campaign/ad group and skips exact (text + match type) duplicates, so repeated runs stay idempotent and do not burn the 10,000-negatives-per-campaign limit. Set false to write them anyway.

Give campaign_id to block the term across the whole campaign, or ad_group_id to block it in ONE ad group only — the latter is what cross-negation needs (each ad group serves only its own theme, negating the other groups' core terms inside a single campaign). If both are given, ad_group_id wins. Undo: remove_negative_keyword (bulk: criterion_ids=[...] or keywords=[...]) at campaign level; manage_keywords(action='remove') at ad group level — list_negative_keywords returns the ids. If confirm=false, returns a dry-run preview of the WHOLE batch.