private function getApiCredentialsByRequest($transactionType)
{
$isAuth = in_array($transactionType, array(self::TRANSACTION_TYPE_SALE, self::TRANSACTION_TYPE_PREAUTHORIZATION, self::TRANSACTION_TYPE_POSTAUTHORIZATION));
if ($isAuth) {
return array($this->configuration->getAuthorizationUsername(), $this->configuration->getAuthorizationPassword());
} else {
return array($this->configuration->getRefundUsername(), $this->configuration->getRefundPassword());
}
}