/**
  * Add risk score to the message we send to the pending queue.
  * The IPN listener will combine this with scores based on CVV and AVS
  * results returned with the authorization notification and determine
  * whether to capture the payment or leave it for manual review.
  * @return array
  */
 protected function getStompTransaction()
 {
     $transaction = parent::getStompTransaction();
     $transaction['risk_score'] = $this->risk_score;
     return $transaction;
 }