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

    protected function verifySignature()
    {
        $signer = new Signer($this->params->all());
        $signer->setSort($this->sort);
        $content = $signer->getContentToSign();
        $sign = $this->params->get('sign');
        $signType = strtoupper($this->params->get('sign_type'));
        if ($signType == 'MD5') {
            if (!$this->getKey()) {
                throw new InvalidRequestException('The `key` is required for `MD5` sign_type');
            }
            $match = (new Signer())->verifyWithMD5($content, $sign, $this->getKey());
        } elseif ($signType == 'RSA') {
            if (!$this->getAlipayPublicKey()) {
                throw new InvalidRequestException('The `alipay_public_key` is required for `RSA` sign_type');
            }
            $match = (new Signer())->verifyWithRSA($content, $sign, $this->getAlipayPublicKey());
        } else {
            throw new InvalidRequestException('The `sign_type` is invalid');
        }
        if (!$match) {
            throw new InvalidRequestException('The signature is not match');
        }
    }