account | GadsAccountItem or object or array of object or string or integer | Yes | - | Google Ads account for the brand lookup. |
brand_prefix | string | Yes | - | Brand name or starting characters to search for, for example ‘Nike’. Returns matching brands from Google’s brand library, not competitor recommendations. |
selected_brands | string or array of string | No | - | Brand IDs to exclude from suggestions because they are already selected. Use IDs returned by this operation, not brand names. Accepts a list, a JSON array, or comma/newline-separated IDs. This only filters the lookup results; it does not change any brand list or campaign. |