fkooman\OAuth\Client\TokenResponse::setExpiresIn PHP Method

    public function setExpiresIn($expiresIn)
    {
        if (!is_int($expiresIn) || 0 >= $expiresIn) {
            throw new TokenResponseException('expires_in needs to be a positive integer');
        }
        $this->expiresIn = $expiresIn;
    }