Retrieve PMAX search terms that triggered ads for a specified campaign.
Args: customer_id: The Google Ads customer ID campaign_id: The campaign ID (required for PMAX search terms) login_customer_id: Optional manager account ID days: Number of days of historical data to retrieve (1-180) limit: Maximum number of search terms to return (1-10000) oauth2_token: OAuth2 token for authentication
Returns: List of PMAX search terms with performance data
The access token received from the authorization server in the OAuth 2.0 flow.