Google Ads API v21 released with AI Max for Search, PMax search terms and EU political ads declaration

v21 (released alongside minor versions v20.1 and v19.2) added Campaign.contains_eu_political_advertising, the campaign_search_term_view exposing Performance Max search terms, ai_max_setting.enable_ai_max plus the ai_max_search_term_ad_combination_view, brand guidelines on by default for new PMax campaigns, and QR codes, barcodes and terms in PromotionAssets.

Other v21 changes covered in related posts: debug_enabled removed from UploadClickConversionsRequest; campaign-level API support for PMax image enhancement / landing page image settings; brand guidelines enabled by default for API-created PMax campaigns. Note the blog post URL slug says v19-release but the post announces v21. v21 sunset: August 5, 2026.