SimpleCloudNotifier/web/register.php

<?php

include_once 'model.php';

$INPUT = array_merge($_GET, $_POST);

if (!isset($INPUT['fcm_token'])) die(json_encode(['success' => false, 'message' => 'Missing parameter [[fcm_token]]']));

$fcmtoken  = $INPUT['fcm_token'];
$user_key = generateRandomAuthKey();

$pdo = getDatabase();

$stmt = $pdo->prepare('INSERT INTO users (user_key, fcm_token, timestamp_accessed) VALUES (:key, :token, NOW())');
$stmt->execute(['key' => $user_key, 'token' => $fcmtoken]);
$user_id = $pdo->lastInsertId('user_id');

echo json_encode(
[
	'success' => true,
	'user_id' => $user_id,
	'user_key' => $user_key,
	'quota'    => 0,
	'quota_max'=> 100,
	'message' => 'New user registered'
]);

return 0;