code: def _ExtractRequestSummaryFields(document):
    
    headers = document.childAtPath('Header/RequestHeader')
    body = document.childAtPath('Body')
  
    summary_fields = {
        'methodName': body.getChildren()[0].name
    }
  
    # Extract AdWords-specific fields if they exist.
    # Note: We need to check if None because this will always evaluate False.
    client_customer_id = headers.getChild('clientCustomerId')
    if client_customer_id is not None:
      summary_fields['clientCustomerId'] = client_customer_id.text
  
    # Extract Ad Manager-specific fields if they exist.
    # Note: We need to check if None because this will always evaluate False.
    network_code = headers.getChild('networkCode')
    if network_code is not None:
      summary_fields['networkCode'] = network_code.text
  
    return summary_fields
docs: Extract logging fields from the request's suds.sax.element.Element.
  
    Args:
      document: A suds.sax.element.Element instance containing the API request.
  
    Returns:
      A dict mapping logging field names to their corresponding value.