$jwt = getBearerToken();

try {

$decoded = JWT::decode($jwt, $key, array('HS256'));
$refresh_token=$decoded->data->refresh_token;

}

catch (Exception $e){

if($e->getMessage() == "Expired token"){
    list($header, $payload, $signature) = explode(".", $jwt);
    $payload = json_decode(base64_decode($payload));
    $refresh_token = $payload->data->refresh_token;

} else {

    // set response code
    http_response_code(401);

    // show error message
    echo json_encode(array(
        "message" => "Access denied.",
        "error" => $e->getMessage()
    ));
    die();
    }
}