diff --git a/lib/Collector.php b/lib/Collector.php
index 0f47838..f03d319 100644
--- a/lib/Collector.php
+++ b/lib/Collector.php
@@ -18,6 +18,8 @@
 use OCA\Survey_Client\Categories\Stats;
 use OCP\AppFramework\Http;
 use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\Services\IAppConfig;
+use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Http\Client\IClientService;
 use OCP\IConfig;
 use OCP\IDBConnection;
@@ -27,32 +29,20 @@ class Collector {
 	public const SURVEY_SERVER_URL = 'https://surveyserver.nextcloud.com/';
 
 	/** @var ICategory[] */
-	protected $categories;
-
-	/** @var IClientService */
-	protected $clientService;
-
-	/** @var IConfig */
-	protected $config;
-
-	/** @var IDBConnection */
-	protected $connection;
-
-	/** @var IniGetWrapper */
-	protected $phpIni;
-
-	/** @var IL10N */
-	protected $l;
-
-	public function __construct(IClientService $clientService, IConfig $config, IDBConnection $connection, IniGetWrapper $phpIni, IL10N $l) {
-		$this->clientService = $clientService;
-		$this->config = $config;
-		$this->connection = $connection;
-		$this->phpIni = $phpIni;
-		$this->l = $l;
+	protected array $categories;
+
+	public function __construct(
+		protected IClientService $clientService,
+		protected IConfig $config,
+		protected IAppConfig $appConfig,
+		protected IDBConnection $connection,
+		protected IniGetWrapper $phpIni,
+		protected IL10N $l,
+		protected ITimeFactory $timeFactory,
+	) {
 	}
 
-	protected function registerCategories() {
+	protected function registerCategories(): void {
 		$this->categories[] = new Server(
 			$this->config,
 			$this->l
@@ -85,9 +75,9 @@ protected function registerCategories() {
 	}
 
 	/**
-	 * @return array
+	 * @return array<string, array{displayName: string, enabled: bool}>
 	 */
-	public function getCategories() {
+	public function getCategories(): array {
 		$this->registerCategories();
 
 		$categories = [];
@@ -95,7 +85,7 @@ public function getCategories() {
 		foreach ($this->categories as $category) {
 			$categories[$category->getCategory()] = [
 				'displayName' => $category->getDisplayName(),
-				'enabled' => $this->config->getAppValue('survey_client', $category->getCategory(), 'yes') === 'yes',
+				'enabled' => $this->appConfig->getAppValueBool($category->getCategory(), true),
 			];
 		}
 
@@ -103,14 +93,14 @@ public function getCategories() {
 	}
 
 	/**
-	 * @return array
+	 * @return array{id: string, items: array}
 	 */
 	public function getReport() {
 		$this->registerCategories();
 
 		$tuples = [];
 		foreach ($this->categories as $category) {
-			if ($this->config->getAppValue('survey_client', $category->getCategory(), 'yes') === 'yes') {
+			if ($this->appConfig->getAppValueBool($category->getCategory(), true)) {
 				foreach ($category->getData() as $key => $value) {
 					$tuples[] = [
 						$category->getCategory(),
@@ -150,8 +140,8 @@ public function sendReport(): DataResponse {
 		}
 
 		if ($response->getStatusCode() === Http::STATUS_OK) {
-			$this->config->setAppValue('survey_client', 'last_sent', (string)time());
-			$this->config->setAppValue('survey_client', 'last_report', json_encode($report));
+			$this->appConfig->setAppValueInt('last_sent', $this->timeFactory->getTime());
+			$this->appConfig->setAppValueString('last_report', json_encode($report), true);
 			return new DataResponse(
 				$report
 			);
diff --git a/lib/Settings/AdminSettings.php b/lib/Settings/AdminSettings.php
index 6e314ab..19952f1 100644
--- a/lib/Settings/AdminSettings.php
+++ b/lib/Settings/AdminSettings.php
@@ -7,8 +7,10 @@
 
 namespace OCA\Survey_Client\Settings;
 
+use OCA\Survey_Client\BackgroundJobs\MonthlyReport;
 use OCA\Survey_Client\Collector;
 use OCP\AppFramework\Http\TemplateResponse;
+use OCP\AppFramework\Services\IAppConfig;
 use OCP\BackgroundJob\IJobList;
 use OCP\IConfig;
 use OCP\IDateTimeFormatter;
@@ -16,53 +18,34 @@
 use OCP\Settings\ISettings;
 
 class AdminSettings implements ISettings {
-
-	/** @var Collector */
-	private $collector;
-
-	/** @var IConfig */
-	private $config;
-
-	/** @var IL10N */
-	private $l;
-
-	/** @var IDateTimeFormatter */
-	private $dateTimeFormatter;
-
-	/** @var IJobList */
-	private $jobList;
-
-	public function __construct(Collector $collector,
-		IConfig $config,
-		IL10N $l,
-		IDateTimeFormatter $dateTimeFormatter,
-		IJobList $jobList,
+	public function __construct(
+		protected Collector $collector,
+		protected IConfig $config,
+		protected IAppConfig $appConfig,
+		protected IL10N $l,
+		protected IDateTimeFormatter $dateTimeFormatter,
+		protected IJobList $jobList,
 	) {
-		$this->collector = $collector;
-		$this->config = $config;
-		$this->l = $l;
-		$this->dateTimeFormatter = $dateTimeFormatter;
-		$this->jobList = $jobList;
 	}
 
 	/**
 	 * @return TemplateResponse
 	 */
-	public function getForm() {
-		$lastSentReportTime = (int)$this->config->getAppValue('survey_client', 'last_sent', '0');
+	public function getForm(): TemplateResponse {
+		$lastSentReportTime = $this->appConfig->getAppValueInt('last_sent');
 		if ($lastSentReportTime === 0) {
 			$lastSentReportDate = $this->l->t('Never');
 		} else {
 			$lastSentReportDate = $this->dateTimeFormatter->formatDate($lastSentReportTime);
 		}
 
-		$lastReport = $this->config->getAppValue('survey_client', 'last_report', '');
+		$lastReport = $this->appConfig->getAppValueString('last_report', lazy: true);
 		if ($lastReport !== '') {
 			$lastReport = json_encode(json_decode($lastReport, true), JSON_PRETTY_PRINT);
 		}
 
 		$parameters = [
-			'is_enabled' => $this->jobList->has('OCA\Survey_Client\BackgroundJobs\MonthlyReport', null),
+			'is_enabled' => $this->jobList->has(MonthlyReport::class, null),
 			'last_sent' => $lastSentReportDate,
 			'last_report' => $lastReport,
 			'categories' => $this->collector->getCategories()
@@ -74,7 +57,7 @@ public function getForm() {
 	/**
 	 * @return string the section ID, e.g. 'sharing'
 	 */
-	public function getSection() {
+	public function getSection(): string {
 		return 'survey_client';
 	}
 
@@ -83,7 +66,7 @@ public function getSection() {
 	 *             the admin section. The forms are arranged in ascending order of the
 	 *             priority values. It is required to return a value between 0 and 100.
 	 */
-	public function getPriority() {
+	public function getPriority(): int {
 		return 50;
 	}
 }