Omnipay\Alipay\Requests\AopNotifyRequest::verifySignature PHP Метод

    protected function verifySignature()
    {
        $signer = new Signer($this->params->all());
        $signer->setSort($this->sort);
        $signer->setEncodePolicy($this->encodePolicy);
        $content = $signer->getContentToSign();
        $sign = $this->params->get('sign');
        $match = (new Signer())->verifyWithRSA($content, $sign, $this->getAlipayPublicKey());
        if (!$match) {
            throw new InvalidRequestException('The signature is not match');
        }
    }