/**
* Calculates request MAC code
* @param \App\Payment\PaymentSystem\Life\Request $request
* @param null|array $macFields
* @return string
*/
public function calculateRequestMAC(Request $request, $macFields = null)
{
$fields = is_array($macFields) ? $macFields : $this->macFields;
$source = $request->calculateMACSourceString($fields);
$key = $this->getKey();
$result = hash_hmac('sha1', $source, pack("H*", $key));
return $result;
}
