code: public function recognizeKeyCaptcha(
          $SSCUserId,
          $SSCSessionId,
          $SSCWebServerSign,
          $SSCWebServerSign2,
          $pageUrl,
          $extra = []
      ) {
          $captchaId = $this
              ->sendKeyCaptcha($SSCUserId, $SSCSessionId, $SSCWebServerSign, $SSCWebServerSign2, $pageUrl, $extra);
  
          $startTime = time();
  
          while (true) {
              $this->getLogger()->info("Waiting {$this->rTimeout} sec.");
  
              sleep($this->recaptchaRTimeout);
  
              if (time() - $startTime >= $this->mTimeout) {
                  throw new RuntimeException("Captcha waiting timeout.");
              }
  
              $result = $this->getCaptchaResult($captchaId);
  
              if ($result === false) {
                  continue;
              }
  
              $this->getLogger()->info("Elapsed " . (time()-$startTime) . " second(s).");
  
              return $result;
          }
  
          throw new RuntimeException('Unknown recognition logic error.');
      }
docs: Keycaptcha recognition.
  
  @param string $SSCUserId
  @param string $SSCSessionId
  @param string $SSCWebServerSign
  @param string $SSCWebServerSign2
  @param string $pageUrl
  @param array $extra
  @return string                       # Code to place into id="capcode" input value
  @throws ErrorResponseException
  @throws InvalidArgumentException
  @throws RuntimeException
  @throws \GuzzleHttp\Exception\GuzzleException