private function hmacSign($value): string
    {
        return hash_hmac(
            HttpConfig::HMAC_ALGORITHM,
            $value,
            $this->encryption->getKey()
        );
    }
private function hmacSign($value): string
    {
        return hash_hmac(
            HttpConfig::HMAC_ALGORITHM,
            $value,
            $this->encryption->getKey()
        );
    }
private function hmacSign ( $ value ) : string { return hash_hmac ( HttpConfig :: HMAC_ALGORITHM , $ value , $ this -> encryption -> getKey ( ) ) ; }
Sign string.

@param string|null $value

@return string
Sign string .