diff --git a/src/IO/ConnectionFactory.php b/src/IO/ConnectionFactory.php
index b7e4284..32cf55f 100644
--- a/src/IO/ConnectionFactory.php
+++ b/src/IO/ConnectionFactory.php
@@ -32,12 +32,14 @@ public function __construct(string $application_url, string $application_product
 	 */
 	public function create(): Connection
 	{
+		$application_token = $this->settings->load('static:application_token');
+
 		$jwt = Jwt::encode([
 			'application_id' => $this->settings->load('static:application_id'),
 			'application_url' => $this->application_url,
 			'application_product' => $this->application_product,
 			'application_language' => $this->settings->load('static:language') ?? 'en',
-		], $this->settings->load('static:application_token'));
+		], $application_token ?? '');
 
 		if ($jwt === null)
 		{
diff --git a/src/IO/ConnectionStream.php b/src/IO/ConnectionStream.php
index e82492f..c27bee8 100644
--- a/src/IO/ConnectionStream.php
+++ b/src/IO/ConnectionStream.php
@@ -32,7 +32,8 @@ public function run(Request $request): Response
 			'method' => 'POST',
 			'header' => [
 				"Content-type: $request->content_type",
-				"Authorization: Bearer $this->jwt_token"
+				"Authorization: Bearer $this->jwt_token",
+                //"Cookie: XDEBUG_SESSION=10355" //debugging purpose only
 			],
 			'content' => $request->serialize(),
 			'ignore_errors' => true,
diff --git a/src/IO/Request.php b/src/IO/Request.php
index 8a63cc3..fc5711f 100644
--- a/src/IO/Request.php
+++ b/src/IO/Request.php
@@ -7,7 +7,7 @@
  * @link https://www.bulkgate.com/
  */
 
-use BulkGate\Plugin\{JsonException, Strict, Utils\Compress, Utils\Json};
+use BulkGate\Plugin\{JsonException, Strict, Utils\Json};
 
 class Request
 {
diff --git a/src/IO/Response.php b/src/IO/Response.php
index 8e5bb7e..fc628e2 100644
--- a/src/IO/Response.php
+++ b/src/IO/Response.php
@@ -8,7 +8,7 @@
  */
 
 use BulkGate\Plugin\{AuthenticateException, Helpers, InvalidResponseException, Strict, Utils\JsonArray};
-use function is_string;
+use function array_key_exists, is_string, array_key_first, is_array;
 
 class Response
 {
@@ -49,10 +49,7 @@ private function setData(array $decoded): void
 			throw new InvalidResponseException('empty_response');
 		}
 
-		if (isset($decoded['error']))
-		{
-			throw new InvalidResponseException(is_string($decoded['error']) ? $decoded['error'] : 'unknown_error');
-		}
+		$this->checkError($decoded);
 
 		if (isset($decoded['signal']) && $decoded['signal'] === 'authenticate')
 		{
@@ -63,6 +60,32 @@ private function setData(array $decoded): void
 	}
 
 
+	/**
+	 * @param array<array-key, mixed> $array
+	 * @throws InvalidResponseException
+	 */
+	private function checkError(array $array): void
+	{
+		if (array_key_exists('error', $array))
+		{
+			if (is_string($array['error']))
+			{
+				throw new InvalidResponseException($array['error']);
+			}
+			else if (is_array($array['error']) && !empty($array['error']))
+			{
+				$key = array_key_first($array['error']);
+
+				throw new InvalidResponseException($array['error'][$key]);
+			}
+			else
+			{
+				throw new InvalidResponseException('unknown_error');
+			}
+		}
+	}
+
+
 	/**
 	 * @return mixed
 	 */
diff --git a/src/Settings/Repository/Entity/Setting.php b/src/Settings/Repository/Entity/Setting.php
index f99996d..aef5cc1 100644
--- a/src/Settings/Repository/Entity/Setting.php
+++ b/src/Settings/Repository/Entity/Setting.php
@@ -41,12 +41,12 @@ class Setting implements Entity
 	 */
 	public function __construct(array $list = [])
 	{
-		$this->scope = (string)($list['scope'] ?? 'main');
-		$this->key = (string)($list['key'] ?? 'unknown');
-		$this->type = (string)($list['type'] ?? Helpers::detectType($list['value'] ?? '') ?? 'string');
+		$this->scope = (string) ($list['scope'] ?? 'main');
+		$this->key = (string) ($list['key'] ?? 'unknown');
+		$this->type = (string) ($list['type'] ?? Helpers::detectType($list['value'] ?? '') ?? 'string');
 		$this->value = is_string($list['value'] ?? '') ? Helpers::deserializeValue($list['value'] ?? '', $this->type) : $list['value'] ?? '';
-		$this->datetime = (int)($list['datetime'] ?? time());
-		$this->order = (int)($list['order'] ?? 0);
-		$this->synchronize_flag = Helpers::checkEnum((string)($list['synchronize_flag'] ?? self::SynchronizeDefault), self::SynchronizeFlags, self::SynchronizeDefault);
+		$this->datetime = (int) ($list['datetime'] ?? time());
+		$this->order = (int) ($list['order'] ?? 0);
+		$this->synchronize_flag = Helpers::checkEnum((string) ($list['synchronize_flag'] ?? self::SynchronizeDefault), self::SynchronizeFlags, self::SynchronizeDefault);
 	}
 }
diff --git a/src/Settings/Repository/SettingsDatabase.php b/src/Settings/Repository/SettingsDatabase.php
index 16e027e..7f5b333 100644
--- a/src/Settings/Repository/SettingsDatabase.php
+++ b/src/Settings/Repository/SettingsDatabase.php
@@ -78,7 +78,7 @@ public function createTable(): void
 			"`key` varchar(50) NOT NULL," .
 			"`type` varchar(50) NOT NULL DEFAULT 'string'," .
 			"`value` longtext DEFAULT NULL," .
-			"`datetime` int(11) NOT NULL DEFAULT unix_timestamp(current_timestamp())," .
+			"`datetime` int(11) NOT NULL," .
 			"`order` int(11) NOT NULL DEFAULT 0," .
 			"`synchronize_flag` varchar(50) NOT NULL DEFAULT 'none' COMMENT 'none/add/change/delete'," .
 			"PRIMARY KEY (`scope`,`key`)," .
diff --git a/src/User/Sign.php b/src/User/Sign.php
index 9974b16..994696d 100644
--- a/src/User/Sign.php
+++ b/src/User/Sign.php
@@ -7,8 +7,7 @@
  * @link https://www.bulkgate.com/
  */
 
-use BulkGate\Plugin\{InvalidResponseException, IO\Connection, IO\Request, IO\Url, Settings\Settings, Strict, Utils\Jwt};
-use function array_merge;
+use BulkGate\{Plugin\Eshop\Configuration, Plugin\InvalidResponseException, Plugin\IO\Connection, Plugin\IO\Request, Plugin\IO\Url, Plugin\Settings\Settings, Plugin\Strict, Plugin\Utils\Jwt};
 
 class Sign
 {
@@ -20,34 +19,35 @@ class Sign
 
 	private Url $url;
 
+    private Configuration $configuration;
 
-	public function __construct(Settings $settings, Connection $connection, Url $url)
+
+	public function __construct(Settings $settings, Connection $connection, Url $url, Configuration $configuration)
 	{
 		$this->settings = $settings;
 		$this->connection = $connection;
 		$this->url = $url;
+		$this->configuration = $configuration;
 	}
 
 
-	/**
-	 * @return array{token: string}
-	 */
-	public function authenticate(): array
+	public function authenticate(): ?string
 	{
-		return [
-			'token' => Jwt::encode([
-					'application_id' => $this->settings->load('static:application_id'),
-					// todo
-					'expire' => time() + 300
-				],
-				$this->settings->load('static:application_token')
-			) ?? 'guest'
-		];
+		$token = $this->settings->load('static:application_token');
+
+		return Jwt::encode([
+			'application_id' => $this->settings->load('static:application_id'),
+			'application_url' => $this->configuration->url(),
+			'application_product' => $this->configuration->product(),
+			'application_language' => $this->settings->load('main:language') ?? 'en',
+			'guest' => $token === null,
+			'expire' => time() + 300
+		], $token ?? '');
 	}
 
 
 	/**
-	 * @return array{token: string, redirect: string|null}|array{error: string}
+	 * @return array{token: string|null, redirect: string|null}|array{error: list<string>}
 	 */
 	public function in(string $email, string $password, ?string $eshop_name = null, ?string $success_redirect = null): array
 	{
@@ -63,7 +63,7 @@ public function in(string $email, string $password, ?string $eshop_name = null,
 
 			if (!isset($login['application_id']) || !isset($login['application_token']))
 			{
-				return ['error' => 'unknown_error'];
+				return ['error' => ['unknown_error']];
 			}
 
 			$this->settings->install();
@@ -72,11 +72,11 @@ public function in(string $email, string $password, ?string $eshop_name = null,
 			$this->settings->set('static:application_token', $login['application_token'], ['type' => 'string']);
 			$this->settings->set('static:synchronize', 0, ['type' => 'int']);
 
-			return array_merge($this->authenticate(), ['redirect' => $success_redirect]);
+			return ['token' => $this->authenticate(), 'redirect' => $success_redirect];
 		}
 		catch (InvalidResponseException $e)
 		{
-			return ['error' => $e->getMessage()];
+			return ['error' => [$e->getMessage()]];
 		}
 	}
 
diff --git a/tests/Settings/Repository/SettingsDatabaseTest.phpt b/tests/Settings/Repository/SettingsDatabaseTest.phpt
index b5c2bcc..bc5ece5 100644
--- a/tests/Settings/Repository/SettingsDatabaseTest.phpt
+++ b/tests/Settings/Repository/SettingsDatabaseTest.phpt
@@ -101,7 +101,7 @@ class SettingsDatabaseTest extends TestCase
 	{
 		$repository = new SettingsDatabase($connection = Mockery::mock(Connection::class));
 		$connection->shouldReceive('table')->with('bulkgate_module')->twice()->andReturn('prefix_bulkgate_module');
-		$connection->shouldReceive('execute')->with('CREATE TABLE IF NOT EXISTS `prefix_bulkgate_module` (`scope` varchar(50) NOT NULL DEFAULT \'main\',`key` varchar(50) NOT NULL,`type` varchar(50) NOT NULL DEFAULT \'string\',`value` longtext DEFAULT NULL,`datetime` int(11) NOT NULL DEFAULT unix_timestamp(current_timestamp()),`order` int(11) NOT NULL DEFAULT 0,`synchronize_flag` varchar(50) NOT NULL DEFAULT \'none\' COMMENT \'none/add/change/delete\',PRIMARY KEY (`scope`,`key`),KEY `synchronize_flag` (`synchronize_flag`),KEY `scope_synchronize_flag` (`scope`,`synchronize_flag`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;')->once()->andReturnNull();
+		$connection->shouldReceive('execute')->with('CREATE TABLE IF NOT EXISTS `prefix_bulkgate_module` (`scope` varchar(50) NOT NULL DEFAULT \'main\',`key` varchar(50) NOT NULL,`type` varchar(50) NOT NULL DEFAULT \'string\',`value` longtext DEFAULT NULL,`datetime` int(11) NOT NULL,`order` int(11) NOT NULL DEFAULT 0,`synchronize_flag` varchar(50) NOT NULL DEFAULT \'none\' COMMENT \'none/add/change/delete\',PRIMARY KEY (`scope`,`key`),KEY `synchronize_flag` (`synchronize_flag`),KEY `scope_synchronize_flag` (`scope`,`synchronize_flag`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;')->once()->andReturnNull();
 		$connection->shouldReceive('execute')->with('ALTER TABLE `prefix_bulkgate_module` ENGINE=InnoDB;')->once();
 
 		$repository->createTable();
diff --git a/tests/User/SignTest.phpt b/tests/User/SignTest.phpt
index 1f21e52..4e04f71 100644
--- a/tests/User/SignTest.phpt
+++ b/tests/User/SignTest.phpt
@@ -9,7 +9,7 @@ namespace BulkGate\Plugin\User\Test;
 
 use Mockery;
 use Tester\{Assert, Expect, TestCase};
-use BulkGate\Plugin\{InvalidResponseException, IO\Connection, IO\Request, IO\Response, IO\Url, Settings\Settings, User\Sign};
+use BulkGate\Plugin\{Eshop\ConfigurationDefault, InvalidResponseException, IO\Connection, IO\Request, IO\Response, IO\Url, Settings\Settings, User\Sign};
 use function json_encode;
 
 require_once __DIR__ . '/../bootstrap.php';
@@ -18,21 +18,19 @@ class SignTest extends TestCase
 {
 	public function testAuthenticate(): void
 	{
-		$sign = new Sign($settings = Mockery::mock(Settings::class), Mockery::mock(Connection::class), new Url());
+		$sign = new Sign($settings = Mockery::mock(Settings::class), Mockery::mock(Connection::class), new Url(), new ConfigurationDefault('url', 'eshop', '1.0'));
 
-		$settings->shouldReceive('load')->with('static:application_id')->andReturn(12345);
-		$settings->shouldReceive('load')->with('static:application_token')->andReturn('test_application_token');
-
-		$result = $sign->authenticate();
+		$settings->shouldReceive('load')->with('static:application_token')->once()->andReturn('test_application_token');
+		$settings->shouldReceive('load')->with('static:application_id')->once()->andReturn(12345);
+		$settings->shouldReceive('load')->with('main:language')->once()->andReturn('cs');
 
-		Assert::count(1, $result);
-		Assert::match('~^[A-Za-z0-9\-_]+\.[A-Za-z0-9\-_]+\.[A-Za-z0-9\-_]+$~', $result['token']);
+		Assert::match('~^[A-Za-z0-9\-_]+\.[A-Za-z0-9\-_]+\.[A-Za-z0-9\-_]+$~', $sign->authenticate());
 	}
 
 
 	public function testIn(): void
 	{
-		$sign = new Sign($settings = Mockery::mock(Settings::class), $connection = Mockery::mock(Connection::class), new Url());
+		$sign = new Sign($settings = Mockery::mock(Settings::class), $connection = Mockery::mock(Connection::class), new Url(), new ConfigurationDefault('url', 'eshop', '1.0'));
 		$settings->shouldReceive('install')->withNoArgs()->once();
 		$connection->shouldReceive('run')->with(Mockery::on(function (Request $request): bool
 		{
@@ -43,8 +41,9 @@ class SignTest extends TestCase
 			'application_id' => 12345,
 			'application_token' => 'test_application_token',
 		]]]]])));
-		$settings->shouldReceive('set')->with('static:application_id', 12345, ['type' => 'int']);
 		$settings->shouldReceive('set')->with('static:application_token', 'test_application_token', ['type' => 'string']);
+		$settings->shouldReceive('set')->with('static:application_id', 12345, ['type' => 'int']);
+		$settings->shouldReceive('load')->with('main:language')->once()->andReturn('cs');
 		$settings->shouldReceive('set')->with('static:synchronize', 0, ['type' => 'int']);
 
 		$settings->shouldReceive('load')->with('static:application_id')->andReturn(12345);
@@ -63,33 +62,33 @@ class SignTest extends TestCase
 
 	public function testInInvalid(): void
 	{
-		$sign = new Sign($settings = Mockery::mock(Settings::class), $connection = Mockery::mock(Connection::class), new Url());
+		$sign = new Sign(Mockery::mock(Settings::class), $connection = Mockery::mock(Connection::class), new Url(), new ConfigurationDefault('url', 'eshop', '1.0'));
 		$connection->shouldReceive('run')->with(Mockery::on(function (Request $request): bool {
 			Assert::same('{"email":"test@example.com","password":"test_password","eshop_name":"Test Eshop"}', $request->serialize());
 
 			return true;
 		}))->andReturn(new Response(json_encode(['data' => ['_generic' => ['server' => ['login' => []]]]])));
 
-		Assert::same(['error' => 'unknown_error'], $sign->in('test@example.com', 'test_password', 'Test Eshop', 'test_success_redirect'));
+		Assert::same(['error' => ['unknown_error']], $sign->in('test@example.com', 'test_password', 'Test Eshop', 'test_success_redirect'));
 	}
 
 
 	public function testInError(): void
 	{
-		$sign = new Sign($settings = Mockery::mock(Settings::class), $connection = Mockery::mock(Connection::class), new Url());
+		$sign = new Sign(Mockery::mock(Settings::class), $connection = Mockery::mock(Connection::class), new Url(), new ConfigurationDefault('url', 'eshop', '1.0'));
 		$connection->shouldReceive('run')->with(Mockery::on(function (Request $request): bool {
 			Assert::same('{"email":"test@example.com","password":"test_password","eshop_name":"Test Eshop"}', $request->serialize());
 
 			return true;
 		}))->andThrow(InvalidResponseException::class, 'test_error');
 
-		Assert::same(['error' => 'test_error'], $sign->in('test@example.com', 'test_password', 'Test Eshop', 'test_success_redirect'));
+		Assert::same(['error' => ['test_error']], $sign->in('test@example.com', 'test_password', 'Test Eshop', 'test_success_redirect'));
 	}
 
 
 	public function testOut(): void
 	{
-		$sign = new Sign($setting = Mockery::mock(Settings::class), Mockery::mock(Connection::class), new Url());
+		$sign = new Sign($setting = Mockery::mock(Settings::class), Mockery::mock(Connection::class), new Url(), new ConfigurationDefault('url', 'eshop', '1.0'));
 		$setting->shouldReceive('delete')->with('static:application_token')->andReturnNull();
 
 		$sign->out();