diff --git a/.gitignore b/.gitignore
index f0dcfe4..50b321e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 vendor
 composer.lock
-tests/.phpunit.result.cache
+.phpunit.result.cache
diff --git a/composer.json b/composer.json
index 3b6170a..77113af 100644
--- a/composer.json
+++ b/composer.json
@@ -4,6 +4,7 @@
     },
     "require-dev": {
         "glpi-project/tools": "^0.7.2",
+        "phpstan/phpstan": "^1.10",
         "phpunit/phpunit": "~9.6"
     },
     "config": {
@@ -17,6 +18,7 @@
         }
     },
     "scripts": {
-        "test": "phpunit -c phpunit.xml"
+        "test": "phpunit -c phpunit.xml",
+        "phpstan": "phpstan analyse -c phpstan.neon"
     }
 }
diff --git a/front/ruleimport.form.php b/front/ruleimport.form.php
index dac21a0..41fea6f 100644
--- a/front/ruleimport.form.php
+++ b/front/ruleimport.form.php
@@ -28,6 +28,6 @@
     Html::displayNotFoundError();
 }
 
-$rulecollection = new PluginJamfRuleImportCollection($_SESSION['glpiactive_entity']);
+$rulecollection = new PluginJamfRuleImportCollection();
 
 include(GLPI_ROOT . "/front/rule.common.form.php");
diff --git a/front/ruleimport.php b/front/ruleimport.php
index 594636e..937ddd9 100644
--- a/front/ruleimport.php
+++ b/front/ruleimport.php
@@ -28,6 +28,6 @@
     Html::displayNotFoundError();
 }
 
-$rulecollection = new PluginJamfRuleImportCollection($_SESSION['glpiactive_entity']);
+$rulecollection = new PluginJamfRuleImportCollection();
 
 include(GLPI_ROOT . "/front/rule.common.php");
diff --git a/inc/config.class.php b/inc/config.class.php
index 0130489..526ff17 100644
--- a/inc/config.class.php
+++ b/inc/config.class.php
@@ -33,7 +33,7 @@ class PluginJamfConfig extends CommonDBTM
 
     public function getTabNameForItem(CommonGLPI $item, $withtemplate = 0)
     {
-        if (!$withtemplate && $item->getType() === 'Config') {
+        if (!$withtemplate && $item::class === Config::class) {
             return _x('plugin_info', 'Jamf plugin', 'jamf');
         }
         return '';
@@ -41,7 +41,6 @@ public function getTabNameForItem(CommonGLPI $item, $withtemplate = 0)
 
     public function showForm($ID = -1, array $options = [])
     {
-        global $CFG_GLPI;
         if (!Session::haveRight('config', UPDATE)) {
             return false;
         }
@@ -51,14 +50,15 @@ public function showForm($ID = -1, array $options = [])
             'config' => $config,
             'url' => Toolbox::getItemTypeFormURL('Config'),
         ]);
+        return true;
     }
 
     public static function displayTabContentForItem(CommonGLPI $item, $tabnum = 1, $withtemplate = 0)
     {
-        if ($item->getType() === 'Config') {
-            $config = new self();
-            $config->showForm();
+        if ($item::class === Config::class) {
+            return (new self())->showForm();
         }
+        return false;
     }
 
     public static function undiscloseConfigValue($fields)
diff --git a/inc/connection.class.php b/inc/connection.class.php
index f73cf9c..5b3e030 100644
--- a/inc/connection.class.php
+++ b/inc/connection.class.php
@@ -198,6 +198,11 @@ private function fetchBearerToken()
      */
     public function getClient()
     {
+        /**
+         * @var array $CFG_GLPI
+         */
+        global $CFG_GLPI;
+
         if (!isset($this->client)) {
             if ($this->bearer_token === null) {
                 $this->fetchBearerToken();
diff --git a/inc/devicesync.class.php b/inc/devicesync.class.php
index f1fecaf..d1144ae 100644
--- a/inc/devicesync.class.php
+++ b/inc/devicesync.class.php
@@ -178,7 +178,7 @@ public static function syncAll(): int
         $volume = 0;
 
         $config = PluginJamfConfig::getConfig();
-        $valid_sync_interval = isset($config['sync_interval']) && !empty($config['sync_interval']) && ((int) $config['sync_interval'] >= 1);
+        $valid_sync_interval = isset($config['sync_interval']) && !empty($config['sync_interval']) && ((int)$config['sync_interval'] >= 1);
         if (!$valid_sync_interval) {
             $config['sync_interval'] = 8 * 60;
         }
diff --git a/inc/migration.class.php b/inc/migration.class.php
index 471c72a..4210ce9 100644
--- a/inc/migration.class.php
+++ b/inc/migration.class.php
@@ -59,7 +59,7 @@ public function __construct($version)
     public function applyMigrations()
     {
         $rc = new ReflectionClass($this);
-        $otherMigrationFunctions = array_map(static function ($rm) use ($rc) {
+        $otherMigrationFunctions = array_map(static function ($rm) {
             return $rm->getShortName();
         }, array_filter($rc->getMethods(), static function ($m) {
             return preg_match('/(?<=^apply_)(.*)(?=_migration$)/', $m->getShortName());
@@ -473,18 +473,6 @@ public function apply_2_1_0_migration()
             ]);
         }
 
-        $old_jsspassword = Config::getConfigurationValues('plugin:Jamf', ['jsspassword'])['jsspassword'] ?? '';
-        if (!empty($old_jsspassword)) {
-            $glpi_key = new GLPIKey();
-            $this->db->update(Config::getTable(), [
-                'value' => $glpi_key->encrypt(Toolbox::decrypt($old_jsspassword))
-            ], [
-                'context' => 'plugin:Jamf',
-                'name' => 'jsspassword'
-            ]);
-        }
-        unset($old_jsspassword);
-
         $this->glpiMigration->addRight(PluginJamfComputer::$rightname, ALLSTANDARDRIGHT);
     }
 
diff --git a/inc/profile.class.php b/inc/profile.class.php
index 70f4549..86b4de9 100644
--- a/inc/profile.class.php
+++ b/inc/profile.class.php
@@ -70,7 +70,8 @@ public function showForm($profiles_id = 0, $openform = true, $closeform = true)
         echo "<div class='spaced'>";
         $profile = new Profile();
         $profile->getFromDB($profiles_id);
-        if ($openform && ($canedit = Session::haveRightsOr(self::$rightname, [CREATE, UPDATE, PURGE]))) {
+        $canedit = Session::haveRightsOr(self::$rightname, [CREATE, UPDATE, PURGE]);
+        if ($openform && $canedit) {
             echo "<form method='post' action='" . $profile::getFormURL() . "'>";
         }
 
diff --git a/inc/sync.class.php b/inc/sync.class.php
index 7c5112c..01c21b5 100644
--- a/inc/sync.class.php
+++ b/inc/sync.class.php
@@ -115,7 +115,7 @@ abstract class PluginJamfSync
      * @param CommonDBTM|null $item
      * @param array $data
      */
-    public function __construct(CommonDBTM $item = null, array $data = [])
+    final public function __construct(CommonDBTM $item = null, array $data = [])
     {
         /** @global DBmysql */
         global $DB;
diff --git a/inc/user_jssaccount.class.php b/inc/user_jssaccount.class.php
index fb51c11..69cd717 100644
--- a/inc/user_jssaccount.class.php
+++ b/inc/user_jssaccount.class.php
@@ -46,10 +46,11 @@ public static function getTypeName($nb = 0)
     public function prepareInputForUpdate($input)
     {
         global $DB;
-        if ($input['jssaccounts_id'] == 0) {
+        if ($input['jssaccounts_id'] === 0) {
             $DB->delete(self::getTable(), ['id' => $this->fields['id']]);
             return false;
         }
+        return $input;
     }
 
     public function getTabNameForItem(CommonGLPI $item, $withtemplate = 0)
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..bffe78f
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,14 @@
+parameters:
+    parallel:
+        maximumNumberOfProcesses: 2
+    level: 1
+    bootstrapFiles:
+        - ../../inc/includes.php
+    paths:
+        - ajax
+        - front
+        - inc
+        - setup.php
+        - hook.php
+    stubFiles:
+        - ../../stubs/glpi_constants.php
diff --git a/setup.php b/setup.php
index 0ca124a..f95d859 100644
--- a/setup.php
+++ b/setup.php
@@ -29,36 +29,39 @@ function plugin_init_jamf()
     global $PLUGIN_HOOKS;
 
     $PLUGIN_HOOKS['csrf_compliant']['jamf'] = true;
-    $PLUGIN_HOOKS['add_javascript']['jamf'][] = 'js/jamf.js';
-    Plugin::registerClass('PluginJamfConfig', ['addtabon' => 'Config']);
-    $PLUGIN_HOOKS['post_item_form']['jamf'] = 'plugin_jamf_showJamfInfoForItem';
-    $PLUGIN_HOOKS['pre_item_update']['jamf']['Phone'] = ['PluginJamfMobileDevice', 'preUpdatePhone'];
-    $PLUGIN_HOOKS['undiscloseConfigValue']['jamf'] = [PluginJamfConfig::class, 'undiscloseConfigValue'];
-    Plugin::registerClass('PluginJamfRuleImportCollection', ['rulecollections_types' => true]);
-    Plugin::registerClass('PluginJamfProfile', ['addtabon' => ['Profile']]);
-    Plugin::registerClass('PluginJamfItem_ExtensionAttribute', ['addtabon' => [
-        'Computer',
-        'Phone'
-    ]]);
-    Plugin::registerClass('PluginJamfItem_MDMCommand', ['addtabon' => [
-        'Computer',
-        'Phone'
-    ]]);
-    Plugin::registerClass('PluginJamfUser_JSSAccount', ['addtabon' => ['User']]);
-    if (Session::haveRight('plugin_jamf_mobiledevice', READ)) {
-        $PLUGIN_HOOKS['menu_toadd']['jamf'] = ['tools' => 'PluginJamfMenu'];
-    }
-    $PLUGIN_HOOKS['post_init']['jamf'] = 'plugin_jamf_postinit';
-    $PLUGIN_HOOKS['item_purge']['jamf'] = [
-        'Computer' => ['PluginJamfAbstractDevice', 'plugin_jamf_purgeComputer'],
-        'Phone' => ['PluginJamfAbstractDevice', 'plugin_jamf_purgePhone'],
-        'Software' => ['PluginJamfSoftware', 'plugin_jamf_purgeSoftware']
-    ];
 
-    // Dashboards
-    $PLUGIN_HOOKS['dashboard_cards']['jamf'] = 'plugin_jamf_dashboardCards';
+    if (Plugin::isPluginActive('jamf')) {
+        $PLUGIN_HOOKS['add_javascript']['jamf'][] = 'js/jamf.js';
+        Plugin::registerClass('PluginJamfConfig', ['addtabon' => 'Config']);
+        $PLUGIN_HOOKS['post_item_form']['jamf'] = 'plugin_jamf_showJamfInfoForItem';
+        $PLUGIN_HOOKS['pre_item_update']['jamf']['Phone'] = ['PluginJamfMobileDevice', 'preUpdatePhone'];
+        $PLUGIN_HOOKS['undiscloseConfigValue']['jamf'] = [PluginJamfConfig::class, 'undiscloseConfigValue'];
+        Plugin::registerClass('PluginJamfRuleImportCollection', ['rulecollections_types' => true]);
+        Plugin::registerClass('PluginJamfProfile', ['addtabon' => ['Profile']]);
+        Plugin::registerClass('PluginJamfItem_ExtensionAttribute', ['addtabon' => [
+            'Computer',
+            'Phone'
+        ]]);
+        Plugin::registerClass('PluginJamfItem_MDMCommand', ['addtabon' => [
+            'Computer',
+            'Phone'
+        ]]);
+        Plugin::registerClass('PluginJamfUser_JSSAccount', ['addtabon' => ['User']]);
+        if (Session::haveRight('plugin_jamf_mobiledevice', READ)) {
+            $PLUGIN_HOOKS['menu_toadd']['jamf'] = ['tools' => 'PluginJamfMenu'];
+        }
+        $PLUGIN_HOOKS['post_init']['jamf'] = 'plugin_jamf_postinit';
+        $PLUGIN_HOOKS['item_purge']['jamf'] = [
+            'Computer' => ['PluginJamfAbstractDevice', 'plugin_jamf_purgeComputer'],
+            'Phone' => ['PluginJamfAbstractDevice', 'plugin_jamf_purgePhone'],
+            'Software' => ['PluginJamfSoftware', 'plugin_jamf_purgeSoftware']
+        ];
 
-    $PLUGIN_HOOKS['secured_configs']['Jamf'] = ['jsspassword'];
+        // Dashboards
+        $PLUGIN_HOOKS['dashboard_cards']['jamf'] = 'plugin_jamf_dashboardCards';
+
+        $PLUGIN_HOOKS['secured_configs']['Jamf'] = ['jsspassword'];
+    }
 }
 
 function plugin_version_jamf()
diff --git a/tests/units/PluginJamfComputerSync.php b/tests/units/PluginJamfComputerSync.php
index bccfbfd..a17c1a5 100644
--- a/tests/units/PluginJamfComputerSync.php
+++ b/tests/units/PluginJamfComputerSync.php
@@ -23,7 +23,6 @@
 
 namespace tests\units;
 
-use DbTestCase;
 use PluginJamfComputer;
 use PluginJamfComputerTestSync;
 use PluginJamfExtensionAttribute;
diff --git a/tests/units/PluginJamfMobileSync.php b/tests/units/PluginJamfMobileSync.php
index 6364a8f..24ca8c6 100644
--- a/tests/units/PluginJamfMobileSync.php
+++ b/tests/units/PluginJamfMobileSync.php
@@ -23,7 +23,6 @@
 
 namespace tests\units;
 
-use DbTestCase;
 use Phone;
 use PluginJamfAbstractDevice;
 use PluginJamfExtensionAttribute;