/**
  * @param string[] $requestHeaders
  * @return string
  */
 protected function getAuthorizationHeaderValue($requestHeaders)
 {
     return static::AUTHORIZATION_ID . ' ' . static::AUTHORIZATION_TYPE . ':' . $this->communicatorConfiguration->getApiKeyId() . ':' . base64_encode(hash_hmac(static::HASH_ALGORITHM, $this->getSignData($requestHeaders), $this->communicatorConfiguration->getApiSecret(), true));
 }