/**
  * @param PaymentInformation $paymentInformation
  */
 public function addPaymentInformation(PaymentInformation $paymentInformation)
 {
     $numberOfTransactions = $this->getGroupHeader()->getNumberOfTransactions() + $paymentInformation->getNumberOfTransactions();
     $transactionTotal = $this->getGroupHeader()->getControlSumCents() + $paymentInformation->getControlSumCents();
     $this->groupHeader->setNumberOfTransactions($numberOfTransactions);
     $this->groupHeader->setControlSumCents($transactionTotal);
     $this->paymentInformations[] = $paymentInformation;
 }