/**
  * {@inheritdoc}
  */
 public function getParameters()
 {
     return array_merge(parent::getParameters(), $this->getBearerParameters());
 }
 public function __construct($reference, $amount, $transactionNumber, $callNumber, $subscriberRef = null)
 {
     parent::__construct($reference, $amount, $subscriberRef);
     $this->transactionNumber = $transactionNumber;
     $this->callNumber = $callNumber;
 }