Retrieves detailed information about a specific Google ad including advertiserId, creativeId, format, firstShown, lastShown, and overallImpressions. When Google publishes political-ad transparency data, spend contains the currency and amount bounds, while targeting contains included and excluded age, gender, and location criteria. Targeted locations include their Google criterion ID, display name, full name, and country codes. Optional fields are null when Google does not publish them. regionStats and platformImpressions use lower and upper impression bounds. Variations are best-effort, omit u Uses the caller's OpenAny gateway credentials. Charges and authorization are determined by the gateway.