public function validate($response)
{
if ($response->getReferrer() !== self::$validReferrer) {
throw new Exceptions\InvalidReferrerException();
}
$sig = Signature::generateSignature($this->merchantKey, $response->getMerchantCode(), $response->getPaymentId(), $response->getRefNo(), preg_replace('/[\\.\\,]/', '', $response->getAmount()), $response->getCurrency(), $response->getStatus());
if ($response->getSignature() !== $sig) {
throw new Exceptions\InvalidSignatureException();
}
return true;
}