code: public function cleanBySurrogateKey($keys)
      {
          $type = 'clean by key on ';
          $uri = $this->_getApiServiceUri() . 'purge';
          $num = count($keys);
          $result = false;
          if ($num >= self::FASTLY_MAX_HEADER_KEY_SIZE) {
              $parts = $num / self::FASTLY_MAX_HEADER_KEY_SIZE;
              $additional = ($parts > (int)$parts) ? 1 : 0;
              $parts = (int)$parts + (int)$additional;
              $chunks = ceil($num/$parts);
              $collection = array_chunk($keys, $chunks);
          } else {
              $collection = [$keys];
          }
  
          foreach ($collection as $keys) {
              $payload = json_encode(['surrogate_keys' => $keys]);
              $result = $this->_purge($uri, null, \Zend_Http_Client::POST, $payload);
              if ($result['status']) {
                  foreach ($keys as $key) {
                      $this->logger->execute('surrogate key: ' . $key);
                  }
              }
  
              $canPublishKeyUrlChanges = $this->config->canPublishKeyUrlChanges();
              $canPublishPurgeChanges = $this->config->canPublishPurgeChanges();
  
              if ($this->config->areWebHooksEnabled() && ($canPublishKeyUrlChanges || $canPublishPurgeChanges)) {
                  $status = $result['status'] ? '' : 'FAILED ';
                  $this->sendWebHook($status . '*clean by key on ' . join(" ", $keys) . '*');
  
                  $canPublishPurgeByKeyDebugBacktrace = $this->config->canPublishPurgeByKeyDebugBacktrace();
                  $canPublishPurgeDebugBacktrace = $this->config->canPublishPurgeDebugBacktrace();
  
                  if ($canPublishPurgeByKeyDebugBacktrace == false && $canPublishPurgeDebugBacktrace == false) {
                      return $result['status'];
                  }
  
                  $this->stackTrace($type . join(" ", $keys));
              }
          }
  
          return $result['status'];
      }
docs: Purge Fastly by a given surrogate key
  
  @param $keys
  @return bool|\Magento\Framework\Controller\Result\Json
  @throws \Zend_Uri_Exception