diff --git a/lib/Command/Install.php b/lib/Command/Install.php
index bd233f8302..2fa80fbb02 100644
--- a/lib/Command/Install.php
+++ b/lib/Command/Install.php
@@ -9,7 +9,7 @@
 namespace OCA\Libresign\Command;
 
 use OCA\Libresign\Service\Install\InstallService;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\Console\Input\InputInterface;
@@ -121,7 +121,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 				$ok = true;
 			}
 			if ($input->getOption('cfssl') || $all) {
-				$currentEngine = $this->appConfig->getAppValue('certificate_engine', 'openssl');
+				$currentEngine = $this->appConfig->getValueString('certificate_engine', 'openssl');
 				$this->installService->installCfssl();
 				if ($currentEngine !== 'cfssl') {
 					$output->writeln('<comment>To use CFSSL, set the engine to cfssl with:</comment> config:app:set libresign certificate_engine --value cfssl');
diff --git a/lib/Controller/AdminController.php b/lib/Controller/AdminController.php
index 28114b2649..a8cf3cf59d 100644
--- a/lib/Controller/AdminController.php
+++ b/lib/Controller/AdminController.php
@@ -20,7 +20,7 @@
 use OCP\AppFramework\Http\Attribute\ApiRoute;
 use OCP\AppFramework\Http\Attribute\NoCSRFRequired;
 use OCP\AppFramework\Http\DataResponse;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use OCP\IEventSource;
 use OCP\IEventSourceFactory;
 use OCP\IL10N;
@@ -225,7 +225,7 @@ public function installAndValidate(): void {
 			$this->installService->installJava($async);
 			$this->installService->installJSignPdf($async);
 			$this->installService->installPdftk($async);
-			if ($this->appConfig->getAppValue('certificate_engine') === 'cfssl') {
+			if ($this->appConfig->getValueString(Application::APP_ID, 'certificate_engine') === 'cfssl') {
 				$this->installService->installCfssl($async);
 			}
 
diff --git a/lib/Controller/PageController.php b/lib/Controller/PageController.php
index cae9b3ae7d..856eb28231 100644
--- a/lib/Controller/PageController.php
+++ b/lib/Controller/PageController.php
@@ -36,9 +36,9 @@
 use OCP\AppFramework\Http\FileDisplayResponse;
 use OCP\AppFramework\Http\RedirectResponse;
 use OCP\AppFramework\Http\TemplateResponse;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\AppFramework\Services\IInitialState;
 use OCP\EventDispatcher\IEventDispatcher;
+use OCP\IAppConfig;
 use OCP\IL10N;
 use OCP\IRequest;
 use OCP\IURLGenerator;
@@ -95,7 +95,7 @@ public function index(): TemplateResponse {
 
 		$this->provideSignerSignatues();
 		$this->initialState->provideInitialState('identify_methods', $this->identifyMethodService->getIdentifyMethodsSettings());
-		$this->initialState->provideInitialState('legal_information', $this->appConfig->getAppValue('legal_information'));
+		$this->initialState->provideInitialState('legal_information', $this->appConfig->getValueString(Application::APP_ID, 'legal_information'));
 
 		Util::addScript(Application::APP_ID, 'libresign-main');
 
@@ -575,7 +575,7 @@ public function validationFilePublic(string $uuid): TemplateResponse {
 			);
 		}
 
-		$this->initialState->provideInitialState('legal_information', $this->appConfig->getAppValue('legal_information'));
+		$this->initialState->provideInitialState('legal_information', $this->appConfig->getValueString(Application::APP_ID, 'legal_information'));
 
 		$this->initialState->provideInitialState('file_info',
 			$this->fileService
@@ -598,7 +598,7 @@ public function validationFilePublic(string $uuid): TemplateResponse {
 	}
 
 	private function throwIfValidationPageNotAccessible(): void {
-		$isValidationUrlPrivate = (bool)$this->appConfig->getAppValue('make_validation_url_private', '0');
+		$isValidationUrlPrivate = (bool)$this->appConfig->getValueBool(Application::APP_ID, 'make_validation_url_private', false);
 		if ($this->userSession->isLoggedIn()) {
 			return;
 		}
diff --git a/lib/Handler/CertificateEngine/AEngineHandler.php b/lib/Handler/CertificateEngine/AEngineHandler.php
index 989ed59b1f..7ec79af234 100644
--- a/lib/Handler/CertificateEngine/AEngineHandler.php
+++ b/lib/Handler/CertificateEngine/AEngineHandler.php
@@ -8,14 +8,15 @@
 
 namespace OCA\Libresign\Handler\CertificateEngine;
 
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Exception\EmptyCertificateException;
 use OCA\Libresign\Exception\InvalidPasswordException;
 use OCA\Libresign\Exception\LibresignException;
 use OCA\Libresign\Helper\MagicGetterSetterTrait;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\AppData\IAppDataFactory;
 use OCP\Files\IAppData;
 use OCP\Files\SimpleFS\ISimpleFolder;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use OCP\IDateTimeFormatter;
 use OCP\ITempManager;
@@ -187,19 +188,18 @@ public function translateToLong($name): string {
 	}
 
 	public function setEngine(string $engine): void {
-		$this->appConfig->setAppValue('certificate_engine', $engine);
+		$this->appConfig->setValueString(Application::APP_ID, 'certificate_engine', $engine);
 		$this->engine = $engine;
 	}
 
 	public function getEngine(): string {
-		$this->engine = $this->appConfig->getAppValue('certificate_engine', 'openssl');
+		$this->engine = $this->appConfig->getValueString(Application::APP_ID, 'certificate_engine', 'openssl');
 		return $this->engine;
 	}
 
 	public function populateInstance(array $rootCert): self {
 		if (empty($rootCert)) {
-			$rootCert = $this->appConfig->getAppValue('root_cert');
-			$rootCert = json_decode($rootCert, true);
+			$rootCert = $this->appConfig->getValueString(Application::APP_ID, 'root_cert');
 		}
 		if (!$rootCert) {
 			return $this;
@@ -224,7 +224,7 @@ public function getConfigPath(): string {
 		if ($this->configPath) {
 			return $this->configPath;
 		}
-		$this->configPath = $this->appConfig->getAppValue('config_path');
+		$this->configPath = $this->appConfig->getValueString(Application::APP_ID, 'config_path');
 		if ($this->configPath && str_ends_with($this->configPath, $this->getName() . '_config')) {
 			return $this->configPath;
 		}
@@ -264,9 +264,9 @@ private function getInternalPathOfFolder(ISimpleFolder $node): string {
 
 	public function setConfigPath(string $configPath): void {
 		if (!$configPath) {
-			$this->appConfig->deleteAppValue('config_path');
+			$this->appConfig->deleteKey(Application::APP_ID, 'config_path');
 		} else {
-			$this->appConfig->setAppValue('config_path', $configPath);
+			$this->appConfig->setValueString(Application::APP_ID, 'config_path', $configPath);
 		}
 		$this->configPath = $configPath;
 	}
@@ -300,7 +300,7 @@ public function getUID(): string {
 	}
 
 	public function expirity(): int {
-		$expirity = $this->appConfig->getAppValueInt('expiry_in_days', 365);
+		$expirity = $this->appConfig->getValueInt(Application::APP_ID, 'expiry_in_days', 365);
 		if ($expirity < 0) {
 			return 365;
 		}
@@ -308,7 +308,7 @@ public function expirity(): int {
 	}
 
 	public function isSetupOk(): bool {
-		return $this->appConfig->getAppValue('authkey') ? true : false;
+		return $this->appConfig->getValueBool(Application::APP_ID, 'authkey', false);
 	}
 
 	public function configureCheck(): array {
diff --git a/lib/Handler/CertificateEngine/CfsslHandler.php b/lib/Handler/CertificateEngine/CfsslHandler.php
index 47a1293dfb..42bb7603ff 100644
--- a/lib/Handler/CertificateEngine/CfsslHandler.php
+++ b/lib/Handler/CertificateEngine/CfsslHandler.php
@@ -12,12 +12,13 @@
 use GuzzleHttp\Exception\ConnectException;
 use GuzzleHttp\Exception\RequestException;
 use OC\SystemConfig;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Exception\LibresignException;
 use OCA\Libresign\Handler\CfsslServerHandler;
 use OCA\Libresign\Helper\ConfigureCheckHelper;
 use OCA\Libresign\Service\Install\InstallService;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\AppData\IAppDataFactory;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use OCP\IDateTimeFormatter;
 use OCP\ITempManager;
@@ -125,7 +126,7 @@ public function configureCheck(): array {
 	public function toArray(): array {
 		$return = parent::toArray();
 		if (!empty($return['configPath'])) {
-			$return['cfsslUri'] = $this->appConfig->getAppValue('cfssl_uri');
+			$return['cfsslUri'] = $this->appConfig->getValueString(Application::APP_ID, 'cfssl_uri');
 		}
 		return $return;
 	}
@@ -316,7 +317,7 @@ private function getBinary(): string {
 		$appKeys = $this->appConfig->getAppKeys();
 		$binary = '';
 		if (in_array('cfssl_bin', $appKeys)) {
-			$binary = $this->appConfig->getAppValue('cfssl_bin');
+			$binary = $this->appConfig->getValueString(Application::APP_ID, 'cfssl_bin');
 			if (!file_exists($binary)) {
 				$this->appConfig->deleteAppValue('cfssl_bin');
 			}
@@ -340,7 +341,7 @@ private function getCfsslUri(): string {
 
 		$appKeys = $this->appConfig->getAppKeys();
 		if (in_array('cfssl_uri', $appKeys)) {
-			if ($uri = $this->appConfig->getAppValue('cfssl_uri')) {
+			if ($uri = $this->appConfig->getValueString(Application::APP_ID, 'cfssl_uri')) {
 				return $uri;
 			}
 			// In case config is an empty string
@@ -368,7 +369,7 @@ private function checkBinaries(): array {
 					->setResource('cfssl'),
 			];
 		}
-		$binary = $this->appConfig->getAppValue('cfssl_bin');
+		$binary = $this->appConfig->getValueString(Application::APP_ID, 'cfssl_bin');
 		if (!$binary) {
 			return [
 				(new ConfigureCheckHelper())
diff --git a/lib/Handler/CertificateEngine/Handler.php b/lib/Handler/CertificateEngine/Handler.php
index 22e3d9a90d..46e2ca952c 100644
--- a/lib/Handler/CertificateEngine/Handler.php
+++ b/lib/Handler/CertificateEngine/Handler.php
@@ -8,8 +8,9 @@
 
 namespace OCA\Libresign\Handler\CertificateEngine;
 
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Exception\LibresignException;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 
 class Handler {
 	public function __construct(
@@ -25,7 +26,7 @@ public function __construct(
 	 */
 	public function getEngine(string $engineName = '', array $rootCert = []): AEngineHandler {
 		if (!$engineName) {
-			$engineName = $this->appConfig->getAppValue('certificate_engine', 'openssl');
+			$engineName = $this->appConfig->getValueString(Application::APP_ID, 'certificate_engine', 'openssl');
 		}
 		if ($engineName === 'openssl') {
 			$engine = $this->openSslHandler;
diff --git a/lib/Handler/CertificateEngine/OpenSslHandler.php b/lib/Handler/CertificateEngine/OpenSslHandler.php
index b6f761176b..b038a0efb0 100644
--- a/lib/Handler/CertificateEngine/OpenSslHandler.php
+++ b/lib/Handler/CertificateEngine/OpenSslHandler.php
@@ -10,8 +10,8 @@
 
 use OCA\Libresign\Exception\LibresignException;
 use OCA\Libresign\Helper\ConfigureCheckHelper;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\AppData\IAppDataFactory;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use OCP\IDateTimeFormatter;
 use OCP\ITempManager;
diff --git a/lib/Handler/FooterHandler.php b/lib/Handler/FooterHandler.php
index c0017ae888..0a59730f80 100644
--- a/lib/Handler/FooterHandler.php
+++ b/lib/Handler/FooterHandler.php
@@ -18,10 +18,11 @@
 use Endroid\QrCode\Writer\PngWriter;
 use League\Plates\Engine;
 use Mpdf\Mpdf;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Db\File as FileEntity;
 use OCA\Libresign\Service\PdfParserService;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\File;
+use OCP\IAppConfig;
 use OCP\IL10N;
 use OCP\ITempManager;
 use OCP\IURLGenerator;
@@ -46,7 +47,7 @@ public function __construct(
 	public function getFooter(File $file, FileEntity $fileEntity): string {
 		$this->file = $file;
 		$this->fileEntity = $fileEntity;
-		$add_footer = (bool)$this->appConfig->getAppValue('add_footer', '1');
+		$add_footer = (bool)$this->appConfig->getValueBool(Application::APP_ID, 'add_footer', true);
 		if (!$add_footer) {
 			return '';
 		}
@@ -110,12 +111,12 @@ private function getTemplateVars(): array {
 		$this->templateVars['signedBy'] = iconv(
 			'UTF-8',
 			'windows-1252',
-			$this->appConfig->getAppValue('footer_signed_by', $this->l10n->t('Digital signed by LibreSign.'))
+			$this->appConfig->getValueString(Application::APP_ID, 'footer_signed_by', $this->l10n->t('Digital signed by LibreSign.'))
 		);
 
-		$this->templateVars['linkToSite'] = $this->appConfig->getAppValue('footer_link_to_site', 'https://libresign.coop');
+		$this->templateVars['linkToSite'] = $this->appConfig->getValueString(Application::APP_ID, 'footer_link_to_site', 'https://libresign.coop');
 
-		$this->templateVars['validationSite'] = $this->appConfig->getAppValue('validation_site');
+		$this->templateVars['validationSite'] = $this->appConfig->getValueString(Application::APP_ID, 'validation_site');
 		if ($this->templateVars['validationSite']) {
 			$this->templateVars['validationSite'] = rtrim($this->templateVars['validationSite'], '/') . '/' . $this->fileEntity->getUuid();
 		} else {
@@ -124,12 +125,12 @@ private function getTemplateVars(): array {
 			]);
 		}
 
-		$this->templateVars['validateIn'] = $this->appConfig->getAppValue('footer_validate_in', 'Validate in %s.');
+		$this->templateVars['validateIn'] = $this->appConfig->getValueString(Application::APP_ID, 'footer_validate_in', 'Validate in %s.');
 		if ($this->templateVars['validateIn'] === 'Validate in %s.') {
 			$this->templateVars['validateIn'] = $this->l10n->t('Validate in %s.', ['%s']);
 		}
 
-		if ($this->appConfig->getAppValue('write_qrcode_on_footer', '1')) {
+		if ($this->appConfig->getValueBool(Application::APP_ID, 'write_qrcode_on_footer', true)) {
 			$this->templateVars['qrcode'] = $this->getQrCodeImageBase64($this->templateVars['validationSite']);
 		}
 
@@ -137,7 +138,7 @@ private function getTemplateVars(): array {
 	}
 
 	private function getTemplate(): string {
-		return $this->appConfig->getAppValue('footer_template', file_get_contents(__DIR__ . '/Templates/footer.php'));
+		return $this->appConfig->getValueString(Application::APP_ID, 'footer_template', file_get_contents(__DIR__ . '/Templates/footer.php'));
 	}
 
 	private function getQrCodeImageBase64(string $text): string {
diff --git a/lib/Handler/JSignPdfHandler.php b/lib/Handler/JSignPdfHandler.php
index 6f5c573824..cd97f679e7 100644
--- a/lib/Handler/JSignPdfHandler.php
+++ b/lib/Handler/JSignPdfHandler.php
@@ -10,8 +10,9 @@
 
 use Jeidison\JSignPDF\JSignPDF;
 use Jeidison\JSignPDF\Sign\JSignParam;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Exception\LibresignException;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use Psr\Log\LoggerInterface;
 
 class JSignPdfHandler extends SignEngineHandler {
@@ -45,14 +46,14 @@ public function getJSignPdf(): JSignPDF {
 	 */
 	public function getJSignParam(): JSignParam {
 		if (!$this->jSignParam) {
-			$javaPath = $this->appConfig->getAppValue('java_path');
+			$javaPath = $this->appConfig->getValueString(Application::APP_ID, 'java_path');
 			$this->jSignParam = (new JSignParam())
 				->setTempPath(
-					$this->appConfig->getAppValue('jsignpdf_temp_path', sys_get_temp_dir() . DIRECTORY_SEPARATOR)
+					$this->appConfig->getValueString(Application::APP_ID, 'jsignpdf_temp_path', sys_get_temp_dir() . DIRECTORY_SEPARATOR)
 				)
 				->setIsUseJavaInstalled(empty($javaPath))
 				->setjSignPdfJarPath(
-					$this->appConfig->getAppValue('jsignpdf_jar_path', '/opt/jsignpdf-' . self::VERSION . '/JSignPdf.jar')
+					$this->appConfig->getValueString(Application::APP_ID, 'jsignpdf_jar_path', '/opt/jsignpdf-' . self::VERSION . '/JSignPdf.jar')
 				);
 			if (!empty($javaPath)) {
 				if (!file_exists($javaPath)) {
@@ -84,7 +85,7 @@ private function getHashAlgorithm(): string {
 			}
 		}
 
-		$hashAlgorithm = $this->appConfig->getAppValue('signature_hash_algorithm', 'SHA256');
+		$hashAlgorithm = $this->appConfig->getValueString(Application::APP_ID, 'signature_hash_algorithm', 'SHA256');
 		if (in_array($hashAlgorithm, ['SHA1', 'SHA256', 'SHA384', 'SHA512', 'RIPEMD160'])) {
 			return $hashAlgorithm;
 		}
diff --git a/lib/Handler/Pkcs12Handler.php b/lib/Handler/Pkcs12Handler.php
index 923de0561f..d027622c1a 100644
--- a/lib/Handler/Pkcs12Handler.php
+++ b/lib/Handler/Pkcs12Handler.php
@@ -14,9 +14,9 @@
 use OCA\Libresign\Exception\LibresignException;
 use OCA\Libresign\Handler\CertificateEngine\Handler as CertificateEngineHandler;
 use OCA\Libresign\Service\FolderService;
-use OCP\IAppConfig;
-
 use OCP\Files\File;
+
+use OCP\IAppConfig;
 use OCP\IL10N;
 use OCP\ITempManager;
 use phpseclib3\File\ASN1;
diff --git a/lib/Helper/ValidateHelper.php b/lib/Helper/ValidateHelper.php
index 823a59314e..b3e605ccd9 100644
--- a/lib/Helper/ValidateHelper.php
+++ b/lib/Helper/ValidateHelper.php
@@ -10,6 +10,7 @@
 
 use InvalidArgumentException;
 use OC\AppFramework\Http;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Db\AccountFileMapper;
 use OCA\Libresign\Db\File;
 use OCA\Libresign\Db\FileElement;
@@ -25,11 +26,11 @@
 use OCA\Libresign\Service\FileService;
 use OCA\Libresign\Service\IdentifyMethodService;
 use OCP\AppFramework\Db\DoesNotExistException;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\Config\IUserMountCache;
 use OCP\Files\IMimeTypeDetector;
 use OCP\Files\IRootFolder;
 use OCP\Files\NotFoundException;
+use OCP\IAppConfig;
 use OCP\IGroupManager;
 use OCP\IL10N;
 use OCP\IUser;
@@ -433,7 +434,7 @@ private function getLibreSignFileByNodeId(int $nodeId) {
 	}
 
 	public function canRequestSign(IUser $user): void {
-		$authorized = json_decode($this->appConfig->getAppValue('groups_request_sign', '["admin"]'), true);
+		$authorized = $this->appConfig->getValueArray(Application::APP_ID, 'groups_request_sign', ['admin']);
 		if (empty($authorized)) {
 			$authorized = ['admin'];
 		}
@@ -732,7 +733,7 @@ public function userCanApproveValidationDocuments(?IUser $user, bool $throw = tr
 			return false;
 		}
 
-		$authorized = json_decode($this->appConfig->getAppValue('approval_group', '["admin"]'));
+		$authorized = $this->appConfig->getValueArray(Application::APP_ID, 'approval_group', ['admin']);
 		if (!$authorized || !is_array($authorized) || empty($authorized)) {
 			$authorized = ['admin'];
 		}
diff --git a/lib/Migration/Version7000Date20221026003343.php b/lib/Migration/Version7000Date20221026003343.php
index 292de16d36..c17eb3b2b6 100644
--- a/lib/Migration/Version7000Date20221026003343.php
+++ b/lib/Migration/Version7000Date20221026003343.php
@@ -8,7 +8,8 @@
 
 namespace OCA\Libresign\Migration;
 
-use OCP\AppFramework\Services\IAppConfig;
+use OCA\Libresign\AppInfo\Application;
+use OCP\IAppConfig;
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
 
@@ -20,24 +21,24 @@ public function __construct(
 
 	public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {
 		$rootCert = [];
-		if ($commonName = $this->appConfig->getAppValue('commonName')) {
+		if ($commonName = $this->appConfig->getValueString(Application::APP_ID, 'commonName')) {
 			$rootCert['commonName'] = $commonName;
-			$this->appConfig->deleteAppValue('commonName');
+			$this->appConfig->deleteKey(Application::APP_ID, 'commonName');
 		}
-		if ($country = $this->appConfig->getAppValue('country')) {
+		if ($country = $this->appConfig->getValueString(Application::APP_ID, 'country')) {
 			$rootCert['names']['C'] = $country;
-			$this->appConfig->deleteAppValue('country');
+			$this->appConfig->deleteKey(Application::APP_ID, 'country');
 		}
-		if ($organization = $this->appConfig->getAppValue('organization')) {
+		if ($organization = $this->appConfig->getValueString(Application::APP_ID, 'organization')) {
 			$rootCert['names']['O'] = $organization;
-			$this->appConfig->deleteAppValue('organization');
+			$this->appConfig->deleteKey(Application::APP_ID, 'organization');
 		}
-		if ($organizationalUnit = $this->appConfig->getAppValue('organizationalUnit')) {
+		if ($organizationalUnit = $this->appConfig->getValueString(Application::APP_ID, 'organizationalUnit')) {
 			$rootCert['names']['OU'] = $organizationalUnit;
-			$this->appConfig->deleteAppValue('organizationalUnit');
+			$this->appConfig->deleteKey(Application::APP_ID, 'organizationalUnit');
 		}
 		if ($rootCert) {
-			$this->appConfig->setAppValue('rootCert', json_encode($rootCert));
+			$this->appConfig->setValueArray(Application::APP_ID, 'rootCert', $rootCert);
 		}
 	}
 }
diff --git a/lib/Migration/Version7000Date20221028022904.php b/lib/Migration/Version7000Date20221028022904.php
index ce308f2182..a09f6ca87e 100644
--- a/lib/Migration/Version7000Date20221028022904.php
+++ b/lib/Migration/Version7000Date20221028022904.php
@@ -8,7 +8,8 @@
 
 namespace OCA\Libresign\Migration;
 
-use OCP\AppFramework\Services\IAppConfig;
+use OCA\Libresign\AppInfo\Application;
+use OCP\IAppConfig;
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
 
@@ -26,8 +27,7 @@ public function __construct(
 	 * {"commonName":"Test Company","names":[{"id":"C","value":"BR"},{"id":"O","value":"Organization"},{"id":"OU","value":"Organization Unit"}]}
 	 */
 	public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {
-		$rootCert = $this->appConfig->getAppValue('rootCert');
-		$rootCert = json_decode($rootCert, true);
+		$rootCert = $this->appConfig->getValueArray(Application::APP_ID, 'rootCert');
 		if (is_array($rootCert) && array_key_exists('names', $rootCert)) {
 			$names = [];
 			foreach ($rootCert['names'] as $key => $value) {
@@ -40,7 +40,7 @@ public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array
 			}
 			if (count($names)) {
 				$rootCert['names'] = $names;
-				$this->appConfig->setAppValue('rootCert', json_encode($rootCert));
+				$this->appConfig->setValueArray(Application::APP_ID, 'rootCert', $rootCert);
 			}
 		}
 	}
diff --git a/lib/Migration/Version7000Date20230327094452.php b/lib/Migration/Version7000Date20230327094452.php
index 05831587d8..0280e8afa5 100644
--- a/lib/Migration/Version7000Date20230327094452.php
+++ b/lib/Migration/Version7000Date20230327094452.php
@@ -8,7 +8,8 @@
 
 namespace OCA\Libresign\Migration;
 
-use OCP\AppFramework\Services\IAppConfig;
+use OCA\Libresign\AppInfo\Application;
+use OCP\IAppConfig;
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
 
@@ -27,8 +28,7 @@ public function __construct(
 	 * {"commonName":"Test Company","names":{"C":"BR","O":"Organization","OU":"Organization Unit"}}
 	 */
 	public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {
-		$rootCert = $this->appConfig->getAppValue('rootCert');
-		$rootCert = json_decode($rootCert, true);
+		$rootCert = $this->appConfig->getValueArray(Application::APP_ID, 'rootCert');
 		if (is_array($rootCert) && array_key_exists('names', $rootCert)) {
 			$names = [];
 			foreach ($rootCert['names'] as $value) {
@@ -40,7 +40,7 @@ public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array
 			}
 			if (count($names)) {
 				$rootCert['names'] = $names;
-				$this->appConfig->setAppValue('rootCert', json_encode($rootCert));
+				$this->appConfig->setValueArray(Application::APP_ID, 'rootCert', $rootCert);
 			}
 		}
 	}
diff --git a/lib/Migration/Version8000Date20230410230327.php b/lib/Migration/Version8000Date20230410230327.php
index 77fc285294..68411cf44c 100644
--- a/lib/Migration/Version8000Date20230410230327.php
+++ b/lib/Migration/Version8000Date20230410230327.php
@@ -8,10 +8,11 @@
 
 namespace OCA\Libresign\Migration;
 
-use OCP\AppFramework\Services\IAppConfig;
+use OCA\Libresign\AppInfo\Application;
 use OCP\Files\AppData\IAppDataFactory;
 use OCP\Files\IAppData;
 use OCP\Files\NotFoundException;
+use OCP\IAppConfig;
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
 
@@ -26,7 +27,7 @@ public function __construct(
 	}
 
 	public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {
-		$libresignCliPath = $this->appConfig->getAppValue('libresign_cli_path');
+		$libresignCliPath = $this->appConfig->getValueString(Application::APP_ID, 'libresign_cli_path');
 		if (!$libresignCliPath) {
 			return;
 		}
@@ -36,6 +37,6 @@ public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array
 			$folder->delete();
 		} catch (NotFoundException $e) {
 		}
-		$this->appConfig->deleteAppValue('libresign_cli_path');
+		$this->appConfig->deleteKey(Application::APP_ID, 'libresign_cli_path');
 	}
 }
diff --git a/lib/Migration/Version8000Date20230608004729.php b/lib/Migration/Version8000Date20230608004729.php
index 116dfdbff8..2f6770ca2f 100644
--- a/lib/Migration/Version8000Date20230608004729.php
+++ b/lib/Migration/Version8000Date20230608004729.php
@@ -9,7 +9,8 @@
 namespace OCA\Libresign\Migration;
 
 use Closure;
-use OCP\AppFramework\Services\IAppConfig;
+use OCA\Libresign\AppInfo\Application;
+use OCP\IAppConfig;
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
 
@@ -20,10 +21,10 @@ public function __construct(
 	}
 
 	public function preSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
-		$cfsslBin = $this->appConfig->getAppValue('cfssl_bin');
-		$cfsslUrl = $this->appConfig->getAppValue('cfssl_url');
+		$cfsslBin = $this->appConfig->getValueString(Application::APP_ID, 'cfssl_bin');
+		$cfsslUrl = $this->appConfig->getValueString(Application::APP_ID, 'cfssl_url');
 		if ($cfsslBin || $cfsslUrl) {
-			$this->appConfig->setAppValue('certificate_engine', 'cfssl');
+			$this->appConfig->setValueString(Application::APP_ID, 'certificate_engine', 'cfssl');
 		}
 	}
 }
diff --git a/lib/Migration/Version8000Date20230730032402.php b/lib/Migration/Version8000Date20230730032402.php
index bb5363d164..3fda983a27 100644
--- a/lib/Migration/Version8000Date20230730032402.php
+++ b/lib/Migration/Version8000Date20230730032402.php
@@ -9,8 +9,9 @@
 namespace OCA\Libresign\Migration;
 
 use Closure;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Service\Install\InstallService;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
 
@@ -23,13 +24,13 @@ public function __construct(
 
 	public function preSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
 		$this->installService->installPdftk();
-		if ($rootCert = $this->appConfig->getAppValue('rootCert')) {
-			$this->appConfig->deleteAppValue('rootCert');
-			$this->appConfig->setAppValue('root_cert', $rootCert);
+		if ($rootCert = $this->appConfig->getValueArray(Application::APP_ID, 'rootCert')) {
+			$this->appConfig->deleteKey(Application::APP_ID, 'rootCert');
+			$this->appConfig->setValueArray(Application::APP_ID, 'root_cert', $rootCert);
 		}
-		if ($notifyUnsignedUser = $this->appConfig->getAppValue('notifyUnsignedUser', '')) {
-			$this->appConfig->setAppValue('notify_unsigned_user', $notifyUnsignedUser);
+		if ($notifyUnsignedUser = $this->appConfig->getValueString(Application::APP_ID, 'notifyUnsignedUser', '')) {
+			$this->appConfig->setValueString(Application::APP_ID, 'notify_unsigned_user', $notifyUnsignedUser);
 		}
-		$this->appConfig->deleteAppValue('notifyUnsignedUser');
+		$this->appConfig->deleteKey(Application::APP_ID, 'notifyUnsignedUser');
 	}
 }
diff --git a/lib/Service/AccountFileService.php b/lib/Service/AccountFileService.php
index 3960195500..d785601886 100644
--- a/lib/Service/AccountFileService.php
+++ b/lib/Service/AccountFileService.php
@@ -8,11 +8,12 @@
 
 namespace OCA\Libresign\Service;
 
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Db\AccountFile;
 use OCA\Libresign\Db\AccountFileMapper;
 use OCA\Libresign\Db\File;
 use OCA\Libresign\ResponseDefinitions;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use OCP\IUser;
 
 /**
@@ -47,7 +48,7 @@ public function deleteFile(int $fileId, string $uid): void {
 	 */
 	public function accountFileList(array $filter, ?int $page = null, ?int $length = null): array {
 		$page = $page ?? 1;
-		$length = $length ?? (int)$this->appConfig->getAppValue('length_of_page', '100');
+		$length = $length ?? (int)$this->appConfig->getValueInt(Application::APP_ID, 'length_of_page', 100);
 		$data = $this->accountFileMapper->accountFileList($filter, $page, $length);
 		$data['pagination']->setRouteName('ocs.libresign.File.list');
 		return [
diff --git a/lib/Service/AccountService.php b/lib/Service/AccountService.php
index c28c289922..82724c3ab7 100644
--- a/lib/Service/AccountService.php
+++ b/lib/Service/AccountService.php
@@ -10,6 +10,7 @@
 
 use InvalidArgumentException;
 use OC\Files\Filesystem;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Db\AccountFileMapper;
 use OCA\Libresign\Db\File as FileEntity;
 use OCA\Libresign\Db\FileMapper;
@@ -26,7 +27,6 @@
 use OCA\Settings\Mailer\NewUserMailHelper;
 use OCP\Accounts\IAccountManager;
 use OCP\AppFramework\Db\DoesNotExistException;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Files\Config\IMountProviderCollection;
 use OCP\Files\Config\IUserMountCache;
@@ -36,6 +36,7 @@
 use OCP\Files\IRootFolder;
 use OCP\Files\NotFoundException;
 use OCP\Http\Client\IClientService;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use OCP\IGroupManager;
 use OCP\IL10N;
@@ -235,7 +236,7 @@ public function getCertificateEngineName(): string {
 	 * @return array[]
 	 */
 	public function getConfig(?IUser $user = null): array {
-		$info['identificationDocumentsFlow'] = $this->appConfig->getAppValue('identification_documents') ? true : false;
+		$info['identificationDocumentsFlow'] = $this->appConfig->getValueBool(Application::APP_ID, 'identification_documents', false);
 		$info['hasSignatureFile'] = $this->hasSignatureFile($user);
 		$info['phoneNumber'] = $this->getPhoneNumber($user);
 		$info['isApprover'] = $this->validateHelper->userCanApproveValidationDocuments($user, false);
@@ -312,7 +313,7 @@ public function canRequestSign(?IUser $user = null): bool {
 		if (!$user) {
 			return false;
 		}
-		$authorized = json_decode($this->appConfig->getAppValue('groups_request_sign', '["admin"]'));
+		$authorized = $this->appConfig->getValueArray(Application::APP_ID, 'groups_request_sign', ['admin']);
 		if (empty($authorized)) {
 			return false;
 		}
diff --git a/lib/Service/FolderService.php b/lib/Service/FolderService.php
index 0b459ce3dc..5c1a52c9f5 100644
--- a/lib/Service/FolderService.php
+++ b/lib/Service/FolderService.php
@@ -134,7 +134,7 @@ private function getLibreSignDefaultPath(): string {
 		$path = $this->appConfig->getUserValue($this->userId, 'folder');
 
 		if (empty($path)) {
-			$defaultFolder = $this->appConfig->getAppValue('default_user_folder', 'LibreSign');
+			$defaultFolder = $this->appConfig->getAppValueString('default_user_folder', 'LibreSign');
 			$path = '/' . $defaultFolder;
 			$this->appConfig->setUserValue($this->userId, 'folder', $path);
 		}
diff --git a/lib/Service/IdentifyMethod/AbstractIdentifyMethod.php b/lib/Service/IdentifyMethod/AbstractIdentifyMethod.php
index a3c4bada55..6b69486283 100644
--- a/lib/Service/IdentifyMethod/AbstractIdentifyMethod.php
+++ b/lib/Service/IdentifyMethod/AbstractIdentifyMethod.php
@@ -9,6 +9,7 @@
 namespace OCA\Libresign\Service\IdentifyMethod;
 
 use InvalidArgumentException;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Db\File as FileEntity;
 use OCA\Libresign\Db\IdentifyMethod;
 use OCA\Libresign\Events\SendSignNotificationEvent;
@@ -157,7 +158,7 @@ protected function throwIfFileNotFound(): void {
 	}
 
 	protected function throwIfMaximumValidityExpired(): void {
-		$maximumValidity = (int)$this->identifyService->getAppConfig()->getAppValue('maximum_validity', (string)SessionService::NO_MAXIMUM_VALIDITY);
+		$maximumValidity = (int)$this->identifyService->getAppConfig()->setValueInt(Application::APP_ID, 'maximum_validity', SessionService::NO_MAXIMUM_VALIDITY);
 		if ($maximumValidity <= 0) {
 			return;
 		}
@@ -182,7 +183,7 @@ protected function throwIfInvalidToken(): void {
 
 	protected function renewSession(): void {
 		$this->identifyService->getSessionService()->setIdentifyMethodId($this->getEntity()->getId());
-		$renewalInterval = (int)$this->identifyService->getAppConfig()->getAppValue('renewal_interval', (string)SessionService::NO_RENEWAL_INTERVAL);
+		$renewalInterval = (int)$this->identifyService->getAppConfig()->setValueInt(Application::APP_ID, 'renewal_interval', SessionService::NO_RENEWAL_INTERVAL);
 		if ($renewalInterval <= 0) {
 			return;
 		}
@@ -200,7 +201,7 @@ protected function updateIdentifiedAt(): void {
 	}
 
 	protected function throwIfRenewalIntervalExpired(): void {
-		$renewalInterval = (int)$this->identifyService->getAppConfig()->getAppValue('renewal_interval', (string)SessionService::NO_RENEWAL_INTERVAL);
+		$renewalInterval = (int)$this->identifyService->getAppConfig()->setValueInt(Application::APP_ID, 'renewal_interval', SessionService::NO_RENEWAL_INTERVAL);
 		if ($renewalInterval <= 0) {
 			return;
 		}
diff --git a/lib/Service/IdentifyMethod/Account.php b/lib/Service/IdentifyMethod/Account.php
index 770fe4fa38..f5cebc1c48 100644
--- a/lib/Service/IdentifyMethod/Account.php
+++ b/lib/Service/IdentifyMethod/Account.php
@@ -8,6 +8,7 @@
 
 namespace OCA\Libresign\Service\IdentifyMethod;
 
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Db\IdentifyMethodMapper;
 use OCA\Libresign\Exception\LibresignException;
 use OCA\Libresign\Helper\JSActions;
@@ -126,8 +127,7 @@ public function getSettings(): array {
 	}
 
 	private function isEnabledByDefault(): bool {
-		$config = $this->identifyService->getAppConfig()->getAppValue('identify_methods', '[]');
-		$config = json_decode($config, true);
+		$config = $this->identifyService->getAppConfig()->getValueArray(Application::APP_ID, 'identify_methods', []);
 		if (json_last_error() !== JSON_ERROR_NONE || !is_array($config)) {
 			return true;
 		}
diff --git a/lib/Service/IdentifyMethod/IdentifyService.php b/lib/Service/IdentifyMethod/IdentifyService.php
index f8b3932533..20170d276b 100644
--- a/lib/Service/IdentifyMethod/IdentifyService.php
+++ b/lib/Service/IdentifyMethod/IdentifyService.php
@@ -8,16 +8,17 @@
 
 namespace OCA\Libresign\Service\IdentifyMethod;
 
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Db\FileMapper;
 use OCA\Libresign\Db\IdentifyMethod;
 use OCA\Libresign\Db\IdentifyMethodMapper;
 use OCA\Libresign\Db\SignRequestMapper;
 use OCA\Libresign\Service\SessionService;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\Config\IUserMountCache;
 use OCP\Files\IRootFolder;
+use OCP\IAppConfig;
 use OCP\IL10N;
 use OCP\IURLGenerator;
 use OCP\IUserManager;
@@ -83,12 +84,7 @@ public function getSavedSettings(): array {
 		if (!empty($this->savedSettings)) {
 			return $this->savedSettings;
 		}
-		$config = $this->getAppConfig()->getAppValue('identify_methods', '[]');
-		$config = json_decode($config, true);
-		if (is_array($config)) {
-			$this->savedSettings = $config;
-		}
-		return $this->savedSettings;
+		return $this->getAppConfig()->getValueArray(Application::APP_ID, 'identify_methods', []);
 	}
 
 	public function getEventDispatcher(): IEventDispatcher {
diff --git a/lib/Service/Install/ConfigureCheckService.php b/lib/Service/Install/ConfigureCheckService.php
index d6186e4fd0..2e3f702429 100644
--- a/lib/Service/Install/ConfigureCheckService.php
+++ b/lib/Service/Install/ConfigureCheckService.php
@@ -10,10 +10,11 @@
 
 use OC\AppConfig;
 use OC\SystemConfig;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Handler\CertificateEngine\Handler as CertificateEngine;
 use OCA\Libresign\Handler\JSignPdfHandler;
 use OCA\Libresign\Helper\ConfigureCheckHelper;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use Psr\Log\LoggerInterface;
 
 class ConfigureCheckService {
@@ -105,7 +106,7 @@ public function checkPoppler(): array {
 	 * @return ConfigureCheckHelper[]
 	 */
 	public function checkJSignPdf(): array {
-		$jsignpdJarPath = $this->appConfig->getAppValue('jsignpdf_jar_path');
+		$jsignpdJarPath = $this->appConfig->getValueString(Application::APP_ID, 'jsignpdf_jar_path');
 		if ($jsignpdJarPath) {
 			$resultOfVerify = $this->verify('jsignpdf');
 			if (count($resultOfVerify)) {
@@ -175,7 +176,7 @@ public function checkJSignPdf(): array {
 	 * @return ConfigureCheckHelper[]
 	 */
 	public function checkPdftk(): array {
-		$pdftkPath = $this->appConfig->getAppValue('pdftk_path');
+		$pdftkPath = $this->appConfig->getValueString(Application::APP_ID, 'pdftk_path');
 		if ($pdftkPath) {
 			$resultOfVerify = $this->verify('pdftk');
 			if (count($resultOfVerify)) {
@@ -196,7 +197,7 @@ public function checkPdftk(): array {
 							->setTip('Run occ libresign:install --java'),
 					];
 				}
-				$javaPath = $this->appConfig->getAppValue('java_path');
+				$javaPath = $this->appConfig->getValueString(Application::APP_ID, 'java_path');
 				$version = [];
 				\exec($javaPath . ' -jar ' . $pdftkPath . ' --version 2>&1', $version, $resultCode);
 				if ($resultCode !== 0) {
@@ -294,7 +295,7 @@ private function getErrorAndTipToResultOfVerify(array $result): array {
 	 * @return ConfigureCheckHelper[]
 	 */
 	private function checkJava(): array {
-		$javaPath = $this->appConfig->getAppValue('java_path');
+		$javaPath = $this->appConfig->getValueString(Application::APP_ID, 'java_path');
 		if ($javaPath) {
 			$resultOfVerify = $this->verify('java');
 			if (count($resultOfVerify)) {
diff --git a/lib/Service/Install/InstallService.php b/lib/Service/Install/InstallService.php
index 4c6de3659a..0931c7d16a 100644
--- a/lib/Service/Install/InstallService.php
+++ b/lib/Service/Install/InstallService.php
@@ -21,7 +21,6 @@
 use OCA\Libresign\Handler\CertificateEngine\Handler as CertificateEngineHandler;
 use OCA\Libresign\Handler\CertificateEngine\IEngineHandler;
 use OCA\Libresign\Handler\JSignPdfHandler;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\AppData\IAppDataFactory;
 use OCP\Files\IAppData;
 use OCP\Files\IRootFolder;
@@ -30,6 +29,7 @@
 use OCP\Files\SimpleFS\ISimpleFile;
 use OCP\Files\SimpleFS\ISimpleFolder;
 use OCP\Http\Client\IClientService;
+use OCP\IAppConfig;
 use OCP\ICache;
 use OCP\ICacheFactory;
 use OCP\IConfig;
@@ -421,7 +421,7 @@ public function installJava(?bool $async = false): void {
 			$downloadOk = true;
 		}
 
-		$this->appConfig->setAppValue('java_path', $extractDir . '/jdk-' . self::JAVA_URL_PATH_NAME . '-jre/bin/java');
+		$this->appConfig->setValueString(Application::APP_ID, 'java_path', $extractDir . '/jdk-' . self::JAVA_URL_PATH_NAME . '-jre/bin/java');
 		if ($downloadOk) {
 			$this->writeAppSignature();
 		}
@@ -435,16 +435,16 @@ public function setDistro(string $distro): void {
 	public function getInstallPath(): string {
 		switch ($this->resource) {
 			case 'java':
-				$path = $this->appConfig->getAppValue('java_path');
+				$path = $this->appConfig->getValueString(Application::APP_ID, 'java_path');
 				return substr($path, 0, -strlen('/bin/java'));
 			case 'jsignpdf':
-				$path = $this->appConfig->getAppValue('jsignpdf_jar_path');
+				$path = $this->appConfig->getValueString(Application::APP_ID, 'jsignpdf_jar_path');
 				return substr($path, 0, -strlen('/JSignPdf.jar'));
 			case 'pdftk':
-				$path = $this->appConfig->getAppValue('pdftk_path');
+				$path = $this->appConfig->getValueString(Application::APP_ID, 'pdftk_path');
 				return substr($path, 0, -strlen('/pdftk.jar'));
 			case 'cfssl':
-				$path = $this->appConfig->getAppValue('cfssl_bin');
+				$path = $this->appConfig->getValueString(Application::APP_ID, 'cfssl_bin');
 				return substr($path, 0, -strlen('/cfssl'));
 		}
 		return '';
@@ -466,7 +466,7 @@ public function getLinuxDistributionToDownloadJava(): string {
 	}
 
 	public function uninstallJava(): void {
-		$javaPath = $this->appConfig->getAppValue('java_path');
+		$javaPath = $this->appConfig->getValueString(Application::APP_ID, 'java_path');
 		if (!$javaPath) {
 			return;
 		}
@@ -476,7 +476,7 @@ public function uninstallJava(): void {
 			$folder->delete();
 		} catch (NotFoundException $th) {
 		}
-		$this->appConfig->deleteAppValue('java_path');
+		$this->appConfig->deleteKey(Application::APP_ID, 'java_path');
 	}
 
 	public function installJSignPdf(?bool $async = false): void {
@@ -513,7 +513,7 @@ public function installJSignPdf(?bool $async = false): void {
 		}
 
 		$fullPath = $extractDir . '/jsignpdf-' . JSignPdfHandler::VERSION . '/JSignPdf.jar';
-		$this->appConfig->setAppValue('jsignpdf_jar_path', $fullPath);
+		$this->appConfig->setValueString(Application::APP_ID, 'jsignpdf_jar_path', $fullPath);
 		if ($downloadOk) {
 			$this->writeAppSignature();
 		}
@@ -521,7 +521,7 @@ public function installJSignPdf(?bool $async = false): void {
 	}
 
 	public function uninstallJSignPdf(): void {
-		$jsignpdJarPath = $this->appConfig->getAppValue('jsignpdf_jar_path');
+		$jsignpdJarPath = $this->appConfig->getValueString(Application::APP_ID, 'jsignpdf_jar_path');
 		if (!$jsignpdJarPath) {
 			return;
 		}
@@ -531,7 +531,7 @@ public function uninstallJSignPdf(): void {
 			$folder->delete();
 		} catch (NotFoundException $e) {
 		}
-		$this->appConfig->deleteAppValue('jsignpdf_jar_path');
+		$this->appConfig->deleteKey(Application::APP_ID, 'jsignpdf_jar_path');
 	}
 
 	public function installPdftk(?bool $async = false): void {
@@ -561,7 +561,7 @@ public function installPdftk(?bool $async = false): void {
 			$this->download($url, 'pdftk', $fullPath, $hash);
 		}
 
-		$this->appConfig->setAppValue('pdftk_path', $fullPath);
+		$this->appConfig->setValueString(Application::APP_ID, 'pdftk_path', $fullPath);
 		if ($downloadOk) {
 			$this->writeAppSignature();
 		}
@@ -569,7 +569,7 @@ public function installPdftk(?bool $async = false): void {
 	}
 
 	public function uninstallPdftk(): void {
-		$jsignpdJarPath = $this->appConfig->getAppValue('pdftk_path');
+		$jsignpdJarPath = $this->appConfig->getValueString(Application::APP_ID, 'pdftk_path');
 		if (!$jsignpdJarPath) {
 			return;
 		}
@@ -579,7 +579,7 @@ public function uninstallPdftk(): void {
 			$folder->delete();
 		} catch (NotFoundException $e) {
 		}
-		$this->appConfig->deleteAppValue('pdftk_path');
+		$this->appConfig->deleteKey(Application::APP_ID, 'pdftk_path');
 	}
 
 	public function installCfssl(?bool $async = false): void {
@@ -635,14 +635,14 @@ private function installCfsslByArchitecture(string $architecture): void {
 
 		$cfsslBinPath = $this->getDataDir() . '/' .
 			$this->getInternalPathOfFolder($folder) . '/cfssl';
-		$this->appConfig->setAppValue('cfssl_bin', $cfsslBinPath);
+		$this->appConfig->setValueString(Application::APP_ID, 'cfssl_bin', $cfsslBinPath);
 		if ($downloadOk) {
 			$this->writeAppSignature();
 		}
 	}
 
 	public function uninstallCfssl(): void {
-		$cfsslPath = $this->appConfig->getAppValue('cfssl_bin');
+		$cfsslPath = $this->appConfig->getValueString(Application::APP_ID, 'cfssl_bin');
 		if (!$cfsslPath) {
 			return;
 		}
@@ -652,11 +652,11 @@ public function uninstallCfssl(): void {
 			$folder->delete();
 		} catch (NotFoundException $e) {
 		}
-		$this->appConfig->deleteAppValue('cfssl_bin');
+		$this->appConfig->deleteKey(Application::APP_ID, 'cfssl_bin');
 	}
 
 	public function isCfsslBinInstalled(): bool {
-		if ($this->appConfig->getAppValue('cfssl_bin')) {
+		if ($this->appConfig->getValueString(Application::APP_ID, 'cfssl_bin')) {
 			return true;
 		}
 		return false;
@@ -761,12 +761,12 @@ public function generate(
 			$names
 		);
 
-		$this->appConfig->setAppValue('root_cert', json_encode($rootCert));
-		$this->appConfig->setAppValue('authkey', $privateKey);
+		$this->appConfig->setValueArray(Application::APP_ID, 'root_cert', $rootCert);
+		$this->appConfig->setValueString(Application::APP_ID, 'authkey', $privateKey);
 		/** @var AEngineHandler $engine */
 		if ($engine->getEngine() === 'cfssl') {
-			$this->appConfig->setAppValue('config_path', $engine->getConfigPath());
+			$this->appConfig->setValueString(Application::APP_ID, 'config_path', $engine->getConfigPath());
 		}
-		$this->appConfig->setAppValue('notify_unsigned_user', '1');
+		$this->appConfig->setValueBool(Application::APP_ID, 'notify_unsigned_user', true);
 	}
 }
diff --git a/lib/Service/Install/SignSetupService.php b/lib/Service/Install/SignSetupService.php
index c67c17e906..52a7e05912 100644
--- a/lib/Service/Install/SignSetupService.php
+++ b/lib/Service/Install/SignSetupService.php
@@ -16,8 +16,8 @@
 use OCA\Libresign\Exception\InvalidSignatureException;
 use OCA\Libresign\Exception\SignatureDataNotFoundException;
 use OCP\App\IAppManager;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\NotFoundException;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use phpseclib\Crypt\RSA;
 use phpseclib\File\X509;
@@ -139,7 +139,7 @@ public function writeAppSignature() {
 	public function getInstallPath(): string {
 		switch ($this->resource) {
 			case 'java':
-				$path = $this->appConfig->getAppValue('java_path');
+				$path = $this->appConfig->getValueString(Application::APP_ID, 'java_path');
 				$installPath = substr($path, 0, -strlen('/bin/java'));
 				$distro = $this->getLinuxDistributionToDownloadJava();
 				$expected = "{$this->instanceId}/libresign/{$this->architecture}/{$distro}/java";
@@ -152,15 +152,15 @@ public function getInstallPath(): string {
 				}
 				break;
 			case 'jsignpdf':
-				$path = $this->appConfig->getAppValue('jsignpdf_jar_path');
+				$path = $this->appConfig->getValueString(Application::APP_ID, 'jsignpdf_jar_path');
 				$installPath = substr($path, 0, strrpos($path, '/', -strlen('_/JSignPdf.jar')));
 				break;
 			case 'pdftk':
-				$path = $this->appConfig->getAppValue('pdftk_path');
+				$path = $this->appConfig->getValueString(Application::APP_ID, 'pdftk_path');
 				$installPath = substr($path, 0, -strlen('/pdftk.jar'));
 				break;
 			case 'cfssl':
-				$path = $this->appConfig->getAppValue('cfssl_bin');
+				$path = $this->appConfig->getValueString(Application::APP_ID, 'cfssl_bin');
 				$installPath = substr($path, 0, -strlen('/cfssl'));
 				break;
 			default:
diff --git a/lib/Service/MailService.php b/lib/Service/MailService.php
index 2b5087abac..592af8a74d 100644
--- a/lib/Service/MailService.php
+++ b/lib/Service/MailService.php
@@ -8,11 +8,12 @@
 
 namespace OCA\Libresign\Service;
 
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Db\File;
 use OCA\Libresign\Db\FileMapper;
 use OCA\Libresign\Db\SignRequest;
 use OCA\Libresign\Exception\LibresignException;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use OCP\IL10N;
 use OCP\IURLGenerator;
 use OCP\Mail\IMailer;
@@ -76,7 +77,7 @@ public function notifySignDataUpdated(SignRequest $data, string $email): void {
 	 * @psalm-suppress MixedMethodCall
 	 */
 	public function notifyUnsignedUser(SignRequest $data, string $email): void {
-		$notifyUnsignedUser = (bool)$this->appConfig->getAppValue('notify_unsigned_user', '1');
+		$notifyUnsignedUser = $this->appConfig->getValueBool(Application::APP_ID, 'notify_unsigned_user', true);
 		if (!$notifyUnsignedUser) {
 			return;
 		}
diff --git a/lib/Service/SessionService.php b/lib/Service/SessionService.php
index 79d1a7e9d1..9fbf4e5765 100644
--- a/lib/Service/SessionService.php
+++ b/lib/Service/SessionService.php
@@ -8,7 +8,8 @@
 
 namespace OCA\Libresign\Service;
 
-use OCP\AppFramework\Services\IAppConfig;
+use OCA\Libresign\AppInfo\Application;
+use OCP\IAppConfig;
 use OCP\ISession;
 
 class SessionService {
@@ -39,7 +40,7 @@ public function getIdentifyMethodId(): ?int {
 	}
 
 	public function resetDurationOfSignPage(): void {
-		$renewalInterval = (int)$this->appConfig->getAppValue('renewal_interval', (string)self::NO_RENEWAL_INTERVAL);
+		$renewalInterval = $this->appConfig->setValueInt(Application::APP_ID, 'renewal_interval', self::NO_RENEWAL_INTERVAL);
 		if ($renewalInterval <= self::NO_RENEWAL_INTERVAL) {
 			return;
 		}
diff --git a/lib/Service/SignFileService.php b/lib/Service/SignFileService.php
index 60aa2abe05..4a4c431f3a 100644
--- a/lib/Service/SignFileService.php
+++ b/lib/Service/SignFileService.php
@@ -11,6 +11,7 @@
 use InvalidArgumentException;
 use mikehaertl\pdftk\Command;
 use OC\AppFramework\Http as AppFrameworkHttp;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\DataObjects\VisibleElementAssoc;
 use OCA\Libresign\Db\AccountFile;
 use OCA\Libresign\Db\AccountFileMapper;
@@ -34,7 +35,6 @@
 use OCA\Libresign\Service\IdentifyMethod\IIdentifyMethod;
 use OCA\Libresign\Service\IdentifyMethod\SignatureMethod\EmailToken;
 use OCP\AppFramework\Db\DoesNotExistException;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\Config\IUserMountCache;
@@ -43,6 +43,7 @@
 use OCP\Files\Node;
 use OCP\Files\NotPermittedException;
 use OCP\Http\Client\IClientService;
+use OCP\IAppConfig;
 use OCP\IL10N;
 use OCP\ITempManager;
 use OCP\IURLGenerator;
@@ -135,7 +136,7 @@ public function canDeleteRequestSignature(array $data): void {
 	public function notifyCallback(File $file): void {
 		$uri = $this->libreSignFile->getCallback();
 		if (!$uri) {
-			$uri = $this->appConfig->getAppValue('webhook_sign_url');
+			$uri = $this->appConfig->getValueString(Application::APP_ID, 'webhook_sign_url');
 			if (!$uri) {
 				return;
 			}
@@ -295,7 +296,7 @@ public function sign(): File {
 	}
 
 	public function storeUserMetadata(array $metadata = []): self {
-		$collectMetadata = $this->appConfig->getAppValue('collect_metadata') ? true : false;
+		$collectMetadata = $this->appConfig->getValueBool(Application::APP_ID, 'collect_metadata', false);
 		if (!$collectMetadata || !$metadata) {
 			return $this;
 		}
@@ -548,8 +549,8 @@ private function getPdfToSign(FileEntity $fileData, File $originalFile): File {
 				$input = $this->tempManager->getTemporaryFile('input.pdf');
 				file_put_contents($input, $originalFile->getContent());
 
-				$javaPath = $this->appConfig->getAppValue('java_path');
-				$pdftkPath = $this->appConfig->getAppValue('pdftk_path');
+				$javaPath = $this->appConfig->getValueString(Application::APP_ID, 'java_path');
+				$pdftkPath = $this->appConfig->getValueString(Application::APP_ID, 'pdftk_path');
 				if (!file_exists($javaPath) || !file_exists($pdftkPath)) {
 					throw new LibresignException($this->l10n->t('The admin hasn\'t set up LibreSign yet, please wait.'));
 				}
diff --git a/lib/Settings/Admin.php b/lib/Settings/Admin.php
index 5d7fda1189..8349810049 100644
--- a/lib/Settings/Admin.php
+++ b/lib/Settings/Admin.php
@@ -12,8 +12,8 @@
 use OCA\Libresign\Handler\CertificateEngine\Handler as CertificateEngineHandler;
 use OCA\Libresign\Service\IdentifyMethodService;
 use OCP\AppFramework\Http\TemplateResponse;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\AppFramework\Services\IInitialState;
+use OCP\IAppConfig;
 use OCP\Settings\ISettings;
 use OCP\Util;
 
@@ -37,7 +37,7 @@ public function getForm(): TemplateResponse {
 		);
 		$this->initialState->provideInitialState(
 			'config_path',
-			$this->appConfig->getAppValue('config_path')
+			$this->appConfig->getValueString(Application::APP_ID, 'config_path')
 		);
 		return new TemplateResponse(Application::APP_ID, 'admin_settings');
 	}
diff --git a/src/views/Settings/Validation.vue b/src/views/Settings/Validation.vue
index 5e293344f6..de2d5bdca0 100644
--- a/src/views/Settings/Validation.vue
+++ b/src/views/Settings/Validation.vue
@@ -96,7 +96,7 @@ export default {
 			const response = await axios.get(
 				generateOcsUrl('/apps/provisioning_api/api/v1/config/apps/libresign/make_validation_url_private'),
 			)
-			this.makeValidationUrlPrivate = response.data.ocs.data.data === '1'
+			this.makeValidationUrlPrivate = response.data.ocs.data.data === true
 		},
 		async getAddFooterData() {
 			const response = await axios.get(
@@ -126,7 +126,7 @@ export default {
 			OCP.AppConfig.setValue('libresign', 'validation_site', this.$refs.urlInput.value.trim())
 		},
 		async toggleSetting(setting, value) {
-			OCP.AppConfig.setValue('libresign', setting, value ? 1 : 0)
+			OCP.AppConfig.setValue('libresign', setting, value ? true : false)
 		},
 		placeHolderValidationUrl(data) {
 			if (data !== '') {
diff --git a/tests/Unit/Handler/FooterHandlerTest.php b/tests/Unit/Handler/FooterHandlerTest.php
index d9297eb1f1..f590e16478 100644
--- a/tests/Unit/Handler/FooterHandlerTest.php
+++ b/tests/Unit/Handler/FooterHandlerTest.php
@@ -8,7 +8,7 @@
 
 use OCA\Libresign\Handler\FooterHandler;
 use OCA\Libresign\Service\PdfParserService;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use OCP\IL10N;
 use OCP\ITempManager;
 use OCP\IURLGenerator;
@@ -48,7 +48,7 @@ private function getClass(): FooterHandler {
 	public function testGetFooterWithoutValidationSite(): void {
 		$this->appConfig = $this->createMock(IAppConfig::class);
 		$this->appConfig
-			->method('getAppValue')
+			->method('getValueString')
 			->willReturn('');
 		$file = $this->createMock(\OCP\Files\File::class);
 		$libresignFile = $this->createMock(\OCA\Libresign\Db\File::class);
@@ -60,7 +60,7 @@ public function testGetFooterWithoutValidationSite(): void {
 	public function testGetFooterWithSuccess(array $settings, array $expected): void {
 		$this->appConfig = $this->createMock(IAppConfig::class);
 		$this->appConfig
-			->method('getAppValue')
+			->method('getValueString')
 			->willReturnCallback(function ($key, $default) use ($settings):string {
 				if (array_key_exists($key, $settings)) {
 					return $settings[$key];
@@ -108,13 +108,13 @@ public function testGetFooterWithSuccess(array $settings, array $expected): void
 	public static function dataGetFooterWithSuccess(): array {
 		return [
 			[
-				['add_footer' => '0',], []
+				['add_footer' => false,], []
 			],
 			[
 				[
-					'add_footer' => '1',
+					'add_footer' => true,
 					'validation_site' => 'http://test.coop',
-					'write_qrcode_on_footer' => '1',
+					'write_qrcode_on_footer' => true,
 					'footer_link_to_site' => 'https://libresign.coop',
 					'footer_signed_by' => 'Digital signed by LibreSign.',
 					'footer_validate_in' => 'Validate in %s.',
@@ -138,7 +138,7 @@ public static function dataGetFooterWithSuccess(): array {
 			],
 			[
 				[
-					'add_footer' => '1',
+					'add_footer' => true,
 					'validation_site' => 'http://test.coop',
 					'write_qrcode_on_footer' => '0',
 					'footer_link_to_site' => 'https://libresign.coop',
diff --git a/tests/Unit/Handler/JSignPdfHandlerTest.php b/tests/Unit/Handler/JSignPdfHandlerTest.php
index ab1af4cb56..496d6a5ad7 100644
--- a/tests/Unit/Handler/JSignPdfHandlerTest.php
+++ b/tests/Unit/Handler/JSignPdfHandlerTest.php
@@ -10,7 +10,7 @@
 
 use Jeidison\JSignPDF\JSignPDF;
 use OCA\Libresign\Handler\JSignPdfHandler;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Log\LoggerInterface;
 
diff --git a/tests/Unit/Handler/OpenSslHandlerTest.php b/tests/Unit/Handler/OpenSslHandlerTest.php
index 241561e603..4c20b169a4 100644
--- a/tests/Unit/Handler/OpenSslHandlerTest.php
+++ b/tests/Unit/Handler/OpenSslHandlerTest.php
@@ -8,8 +8,8 @@
 
 use bovigo\vfs\vfsStream;
 use OCA\Libresign\Handler\CertificateEngine\OpenSslHandler;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\AppData\IAppDataFactory;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use OCP\IDateTimeFormatter;
 use OCP\ITempManager;
diff --git a/tests/Unit/Helper/ValidateHelperTest.php b/tests/Unit/Helper/ValidateHelperTest.php
index d1d538ab02..553c756d52 100644
--- a/tests/Unit/Helper/ValidateHelperTest.php
+++ b/tests/Unit/Helper/ValidateHelperTest.php
@@ -19,10 +19,10 @@
 use OCA\Libresign\Exception\LibresignException;
 use OCA\Libresign\Helper\ValidateHelper;
 use OCA\Libresign\Service\IdentifyMethodService;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\Config\IUserMountCache;
 use OCP\Files\IMimeTypeDetector;
 use OCP\Files\IRootFolder;
+use OCP\IAppConfig;
 use OCP\IGroupManager;
 use OCP\IL10N;
 use OCP\IUser;
@@ -218,7 +218,7 @@ public function testCanRequestSignWithoutUserManager():void {
 		$this->expectExceptionMessage('You are not allowed to request signing');
 
 		$this->appConfig
-			->method('getAppValue')
+			->method('getValueString')
 			->willReturn('');
 		$user = $this->createMock(\OCP\IUser::class);
 		$this->getValidateHelper()->canRequestSign($user);
@@ -229,7 +229,7 @@ public function testCanRequestSignWithoutPermission():void {
 
 		$this->appConfig = $this->createMock(IAppConfig::class);
 		$this->appConfig
-			->method('getAppValue')
+			->method('getValueString')
 			->willReturn('["admin"]');
 		$this->groupManager
 			->method('getUserGroupIds')
diff --git a/tests/Unit/Service/AccountFileServiceTest.php b/tests/Unit/Service/AccountFileServiceTest.php
index 2b43e6cbfa..3795de9b40 100644
--- a/tests/Unit/Service/AccountFileServiceTest.php
+++ b/tests/Unit/Service/AccountFileServiceTest.php
@@ -11,7 +11,7 @@
 use OCA\Libresign\Db\AccountFileMapper;
 use OCA\Libresign\Db\File;
 use OCA\Libresign\Service\AccountFileService;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use OCP\IUser;
 use PHPUnit\Framework\MockObject\MockObject;
 
diff --git a/tests/Unit/Service/AccountServiceTest.php b/tests/Unit/Service/AccountServiceTest.php
index b8570bece3..0990b15ae9 100644
--- a/tests/Unit/Service/AccountServiceTest.php
+++ b/tests/Unit/Service/AccountServiceTest.php
@@ -28,11 +28,11 @@
 use OCA\Libresign\Service\SignFileService;
 use OCA\Settings\Mailer\NewUserMailHelper;
 use OCP\Accounts\IAccountManager;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\Config\IMountProviderCollection;
 use OCP\Files\Config\IUserMountCache;
 use OCP\Files\IMimeTypeDetector;
 use OCP\Files\IRootFolder;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use OCP\IGroupManager;
 use OCP\IL10N;
@@ -354,7 +354,7 @@ public function testCreateToSignWithErrorInSendingEmail():void {
 		$this->signRequestMapper->method('getByUuid')->will($this->returnValue($signRequest));
 		$userToSign = $this->createMock(\OCP\IUser::class);
 		$this->userManager->method('createUser')->will($this->returnValue($userToSign));
-		$this->config->method('getAppValue')->will($this->returnValue('yes'));
+		$this->config->method('getValueBool')->will($this->returnValue(true));
 		$template = $this->createMock(\OCP\Mail\IEMailTemplate::class);
 		$this->newUserMail->method('generateTemplate')->will($this->returnValue($template));
 		$this->newUserMail->method('sendMail')->will($this->returnCallback(function ():void {
@@ -405,7 +405,7 @@ public function testCanRequestSignWithUnexistentUser():void {
 
 	public function testCanRequestSignWithoutGroups():void {
 		$this->appConfig
-			->method('getAppValue')
+			->method('getValueString')
 			->willReturn('');
 		$user = $this->createMock(\OCP\IUser::class);
 		$actual = $this->getService()->canRequestSign($user);
@@ -414,8 +414,8 @@ public function testCanRequestSignWithoutGroups():void {
 
 	public function testCanRequestSignWithUserOutOfAuthorizedGroups():void {
 		$this->appConfig
-			->method('getAppValue')
-			->willReturn('["admin"]');
+			->method('getValueArray')
+			->willReturn(['admin']);
 		$this->groupManager
 			->method('getUserGroupIds')
 			->willReturn([]);
@@ -426,8 +426,8 @@ public function testCanRequestSignWithUserOutOfAuthorizedGroups():void {
 
 	public function testCanRequestSignWithSuccess():void {
 		$this->appConfig
-			->method('getAppValue')
-			->willReturn('["admin"]');
+			->method('getValueArray')
+			->willReturn(['admin']);
 		$this->groupManager
 			->method('getUserGroupIds')
 			->willReturn(['admin']);
diff --git a/tests/Unit/Service/FolderServiceTest.php b/tests/Unit/Service/FolderServiceTest.php
index d9669ae06e..f12ab958f7 100644
--- a/tests/Unit/Service/FolderServiceTest.php
+++ b/tests/Unit/Service/FolderServiceTest.php
@@ -10,7 +10,6 @@
 
 use Exception;
 use OCA\Libresign\Service\FolderService;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\AppData\IAppDataFactory;
 use OCP\Files\Config\IUserMountCache;
 use OCP\Files\Folder;
@@ -18,6 +17,7 @@
 use OCP\Files\IRootFolder;
 use OCP\Files\SimpleFS\ISimpleFile;
 use OCP\Files\SimpleFS\ISimpleFolder;
+use OCP\IAppConfig;
 use OCP\IGroupManager;
 use OCP\IL10N;
 use PHPUnit\Framework\MockObject\MockObject;
diff --git a/tests/Unit/Service/Install/SignSetupServiceTest.php b/tests/Unit/Service/Install/SignSetupServiceTest.php
index c21aa11e0a..fb355f6352 100644
--- a/tests/Unit/Service/Install/SignSetupServiceTest.php
+++ b/tests/Unit/Service/Install/SignSetupServiceTest.php
@@ -11,9 +11,11 @@
 use bovigo\vfs\vfsStream;
 use OC\IntegrityCheck\Helpers\EnvironmentHelper;
 use OC\IntegrityCheck\Helpers\FileAccessHelper;
+use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Service\Install\SignSetupService;
+use OCA\Libresign\Tests\lib\AppConfigOverwrite;
 use OCP\App\IAppManager;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use phpseclib\Crypt\RSA;
 use phpseclib\File\X509;
@@ -24,7 +26,7 @@ final class SignSetupServiceTest extends \OCA\Libresign\Tests\Unit\TestCase {
 	private EnvironmentHelper&MockObject $environmentHelper;
 	private FileAccessHelper $fileAccessHelper;
 	private IConfig&MockObject $config;
-	private IAppConfig&MockObject $appConfig;
+	private IAppConfig $appConfig;
 	private IAppManager&MockObject $appManager;
 
 	public function setUp(): void {
@@ -32,7 +34,11 @@ public function setUp(): void {
 		$this->fileAccessHelper = new FileAccessHelper();
 		$this->appManager = $this->createMock(IAppManager::class);
 		$this->config = $this->createMock(IConfig::class);
-		$this->appConfig = $this->createMock(IAppConfig::class);
+		$this->appConfig = new AppConfigOverwrite(
+			\OCP\Server::get(\OCP\IDBConnection::class),
+			\OCP\Server::get(\Psr\Log\LoggerInterface::class),
+			\OCP\Server::get(\OCP\Security\ICrypto::class),
+		);
 	}
 
 	/**
@@ -88,7 +94,7 @@ private function writeAppSignature(string $architecture, $resource): SignSetupSe
 			->willReturn('vfs://home');
 
 		$this->appConfig
-			->method('getAppValue')
+			->method('getValueString')
 			->willReturnCallback(function ($key, $default) use ($architecture):string {
 				return match ($key) {
 					'java_path' => 'vfs://home/data/appdata_1/libresign/' . $architecture . '/linux/java/jdk-21.0.2+13-jre/bin/java',
@@ -205,17 +211,10 @@ public function testVerify(): void {
 
 	#[DataProvider('dataGetInstallPath')]
 	public function testGetInstallPath(string $architecture, string $resource, string $distro, string $expected): void {
-		$this->appConfig
-			->method('getAppValue')
-			->willReturnCallback(function ($key, $default): string {
-				return match ($key) {
-					'java_path' => 'vfs://home/data/appdata_1/libresign/x86_64/linux/java/jdk-21.0.2+13-jre/bin/java',
-					'jsignpdf_jar_path' => 'vfs://home/data/appdata_1/libresign/x86_64/jsignpdf/jsignpdf-2.2.2/JSignPdf.jar',
-					'pdftk_path' => 'vfs://home/data/appdata_1/libresign/x86_64/pdftk/pdftk.jar',
-					'cfssl_bin' => 'vfs://home/data/appdata_1/libresign/x86_64/cfssl/cfssl',
-					default => '',
-				};
-			});
+		$this->appConfig->setValueString(Application::APP_ID, 'java_path', 'vfs://home/data/appdata_1/libresign/x86_64/linux/java/jdk-21.0.2+13-jre/bin/java');
+		$this->appConfig->setValueString(Application::APP_ID, 'jsignpdf_jar_path', 'vfs://home/data/appdata_1/libresign/x86_64/jsignpdf/jsignpdf-2.2.2/JSignPdf.jar');
+		$this->appConfig->setValueString(Application::APP_ID, 'pdftk_path', 'vfs://home/data/appdata_1/libresign/x86_64/pdftk/pdftk.jar');
+		$this->appConfig->setValueString(Application::APP_ID, 'cfssl_bin', 'vfs://home/data/appdata_1/libresign/x86_64/cfssl/cfssl');
 		$actual = $this->getInstance()
 			->setArchitecture($architecture)
 			->setDistro($distro)
diff --git a/tests/Unit/Service/InstallServiceTest.php b/tests/Unit/Service/InstallServiceTest.php
index d7842c3614..8cf3bd1c07 100644
--- a/tests/Unit/Service/InstallServiceTest.php
+++ b/tests/Unit/Service/InstallServiceTest.php
@@ -12,10 +12,10 @@
 use OCA\Libresign\Handler\CertificateEngine\Handler as CertificateEngineHandler;
 use OCA\Libresign\Service\Install\InstallService;
 use OCA\Libresign\Service\Install\SignSetupService;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\Files\AppData\IAppDataFactory;
 use OCP\Files\IRootFolder;
 use OCP\Http\Client\IClientService;
+use OCP\IAppConfig;
 use OCP\ICacheFactory;
 use OCP\IConfig;
 use PHPUnit\Framework\MockObject\MockObject;
diff --git a/tests/Unit/Service/MailServiceTest.php b/tests/Unit/Service/MailServiceTest.php
index 6b7cf64cc0..6ced6f751a 100644
--- a/tests/Unit/Service/MailServiceTest.php
+++ b/tests/Unit/Service/MailServiceTest.php
@@ -12,7 +12,7 @@
 use OCA\Libresign\Db\FileMapper;
 use OCA\Libresign\Db\SignRequest;
 use OCA\Libresign\Service\MailService;
-use OCP\AppFramework\Services\IAppConfig;
+use OCP\IAppConfig;
 use OCP\IL10N;
 use OCP\IURLGenerator;
 use OCP\Mail\IMailer;
@@ -74,8 +74,8 @@ public function testSuccessNotifyUnsignedUser():void {
 			->method('getById')
 			->will($this->returnValue($file));
 		$this->appConfig
-			->method('getAppValue')
-			->willReturn('1');
+			->method('getValueBool')
+			->willReturn(true);
 		$actual = $this->service->notifyUnsignedUser($signRequest, 'a@b.coop');
 		$this->assertNull($actual);
 	}
@@ -108,8 +108,8 @@ public function testFailToSendMailToUnsignedUser():void {
 				throw new \Exception('Error Processing Request', 1);
 			});
 		$this->appConfig
-			->method('getAppValue')
-			->will($this->returnValue('1'));
+			->method('getValueBool')
+			->will($this->retruenValue('1'));
 		$actual = $this->service->notifyUnsignedUser($signRequest, 'a@b.coop');
 		$this->assertNull($actual);
 	}
diff --git a/tests/Unit/Service/SignFileServiceTest.php b/tests/Unit/Service/SignFileServiceTest.php
index cbe9d3ddfc..fc79396d28 100644
--- a/tests/Unit/Service/SignFileServiceTest.php
+++ b/tests/Unit/Service/SignFileServiceTest.php
@@ -20,12 +20,12 @@
 use OCA\Libresign\Service\IdentifyMethodService;
 use OCA\Libresign\Service\SignerElementsService;
 use OCA\Libresign\Service\SignFileService;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\Config\IUserMountCache;
 use OCP\Files\IRootFolder;
 use OCP\Http\Client\IClientService;
+use OCP\IAppConfig;
 use OCP\IL10N;
 use OCP\ITempManager;
 use OCP\IURLGenerator;
diff --git a/tests/Unit/Settings/AdminTest.php b/tests/Unit/Settings/AdminTest.php
index af69700c04..a341a8b322 100644
--- a/tests/Unit/Settings/AdminTest.php
+++ b/tests/Unit/Settings/AdminTest.php
@@ -12,8 +12,8 @@
 use OCA\Libresign\Handler\CertificateEngine\Handler as CertificateEngineHandler;
 use OCA\Libresign\Service\IdentifyMethodService;
 use OCA\Libresign\Settings\Admin;
-use OCP\AppFramework\Services\IAppConfig;
 use OCP\AppFramework\Services\IInitialState;
+use OCP\IAppConfig;
 use PHPUnit\Framework\MockObject\MockObject;
 
 /**
diff --git a/tests/integration/features/page/validate.feature b/tests/integration/features/page/validate.feature
index 744c9a09fb..31c8ddc8a3 100644
--- a/tests/integration/features/page/validate.feature
+++ b/tests/integration/features/page/validate.feature
@@ -12,7 +12,7 @@ Feature: page/validate
   Scenario: Unauthenticated user can not see sign page
     Given as user "admin"
     Given sending "post" to ocs "/apps/provisioning_api/api/v1/config/apps/libresign/make_validation_url_private"
-      | value | 1 |
+      | value | true |
     And as user ""
     When sending "get" to "/apps/libresign/p/validation"
     And the response should be a JSON array with the following mandatory values